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    Human Digestive

    System

    Digestive System Label Me! Printout (Simple

    version)

    Digestive System Label Me! Printout

    The human digestive system is

    a complex series of organs and

    glands that processes food. In

    order to use the food we eat,

    our body has to break the food

    down into smaller molecules

    that it can process; it also has

    to excrete waste.

    Most of the digestive organs(like the stomach and

    intestines) are tube-like and

    contain the food as it makes its

    way through the body. The

    digestive system is essentially

    a long, twisting tube that runs

    from the mouth to the anus,

    plus a few other organs (like

    the liver and pancreas) that produce or store digestive chemicals.

    The Digestive Process:The start of the process - the mouth:The digestive process begins in the mouth.

    Food is partly broken down by the process of chewing and by the chemical action of

    salivary enzymes (these enzymes are produced by the salivary glands and break down

    starches into smaller molecules).

    On the way to the stomach: the esophagus- After being chewed and swallowed, the

    food enters the esophagus. The esophagus is a long tube that runs from the mouth to

    the stomach. It uses rhythmic, wave-like muscle movements (called peristalsis) to

    force food from the throat into the stomach. This muscle movement gives us the

    ability to eat or drink even when we're upside-down.

    In the stomach- The stomach is a large, sack-like organ that churns the food and

    bathes it in a very strong acid (gastric acid). Food in the stomach that is partly

    digested and mixed with stomach acids is called chyme.

    http://www.enchantedlearning.com/subjects/anatomy/digestive/labeleasy/http://www.enchantedlearning.com/subjects/anatomy/digestive/labeleasy/http://www.enchantedlearning.com/subjects/anatomy/digestive/labeleasy/http://www.enchantedlearning.com/subjects/anatomy/digestive/label/http://www.enchantedlearning.com/subjects/anatomy/digestive/label/http://www.enchantedlearning.com/label/http://www.enchantedlearning.com/subjects/anatomy/digestive/label/http://www.enchantedlearning.com/subjects/anatomy/digestive/labeleasy/http://www.enchantedlearning.com/subjects/anatomy/digestive/labeleasy/
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    In the small intestine- After being in the stomach, food enters the duodenum, the

    first part of the small intestine. It then enters the jejunum and then the ileum (the final

    part of the small intestine). In the small intestine, bile (produced in the liver and stored

    in the gall bladder), pancreatic enzymes, and other digestive enzymes produced by the

    inner wall of the small intestine help in the breakdown of food.

    In the large intestine- After passing through the small intestine, food passes into the

    large intestine. In the large intestine, some of the water and electrolytes (chemicals

    like sodium) are removed from the food. Many microbes (bacteria likeBacteroides,

    Lactobacillus acidophilus,Escherichia coli, andKlebsiella) in the large intestine help

    in the digestion process. The first part of the large intestine is called the cecum (the

    appendix is connected to the cecum). Food then travels upward in the ascending

    colon. The food travels across the abdomen in the transverse colon, goes back down

    the other side of the body in the descending colon, and then through the sigmoid

    colon.

    The end of the process- Solid waste is then stored in the rectum until it is excreted

    via the anus.

    Digestive System Glossary:abdomen- the part of the body that contains the digestive organs. In human beings,

    this is between the diaphragm and the pelvis

    alimentary canal- the passage through which food passes, including the mouth,

    esophagus, stomach, intestines, and anus.

    anus- the opening at the end of the digestive system from which feces (waste) exitsthe body.

    appendix- a small sac located on the cecum.

    ascending colon- the part of the large intestine that run upwards; it is located after

    the cecum.

    bile- a digestive chemical that is produced in the liver, stored in the gall bladder, and

    secreted into the small intestine.

    cecum- the first part of the large intestine; the appendix is connected to the cecum.

    chyme- food in the stomach that is partly digested and mixed with stomach acids.

    Chyme goes on to the small intestine for further digestion.

    descending colon- the part of the large intestine that run downwards after thetransverse colon and before the sigmoid colon.

    digestive system- (also called the gastrointestinal tract or GI tract) the system of the

    body that processes food and gets rid of waste.

    duodenum- the first part of the small intestine; it is C-shaped and runs from the

    stomach to the jejunum.

    epiglottis- the flap at the back of the tongue that keeps chewed food from going

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    down the windpipe to thelungs.When you swallow, the epiglottis automatically

    closes. When you breathe, the epiglottis opens so that air can go in and out of the

    windpipe.

    esophagus- the long tube between the mouth and the stomach. It uses rhythmic

    muscle movements (called peristalsis) to force food from the throat into the stomach.

    gall bladder- a small, sac-like organ located by the duodenum. It stores and releasesbile (a digestive chemical which is produced in the liver) into the small intestine.

    gastrointestinal tract- (also called the GI tract or digestive system) the system of the

    body that processes food and gets rid of waste.

    ileum- the last part of the small intestine before the large intestine begins.

    intestines- the part of the alimentary canal located between the stomach and the anus.

    jejunum- the long, coiled mid-section of the small intestine; it is between the

    duodenum and the ileum.

    liver- a large organ located above and in front of the stomach. It filters toxins from

    the blood, and makes bile (which breaks down fats) and some blood proteins.

    mouth- the first part of the digestive system, where food enters the body. Chewing

    and salivary enzymes in the mouth are the beginning of the digestive process

    (breaking down the food).

    pancreas- an enzyme-producing gland located below the stomach and above the

    intestines. Enzymes from the pancreas help in the digestion of carbohydrates, fats and

    proteins in the small intestine.

    peristalsis- rhythmic muscle movements that force food in the esophagus from the

    throat into the stomach. Peristalsis is involuntary - you cannot control it. It is also

    what allows you to eat and drink while upside-down.

    rectum- the lower part of the large intestine, where feces are stored before they areexcreted.

    salivary glands- glands located in the mouth that produce saliva. Saliva contains

    enzymes that break down carbohydrates (starch) into smaller molecules.

    sigmoid colon- the part of the large intestine between the descending colon and the

    rectum.

    stomach- a sack-like, muscular organ that is attached to the esophagus. Both

    chemical and mechanical digestion takes place in the stomach. When food enters the

    stomach, it is churned in a bath of acids and enzymes.

    transverse colon- the part of the large intestine that runs horizontally across the

    abdomen.

    Eye AnatomyOur eyes are organs that let us see. Eyes detect both brightness and color. Having two

    eyes separated on our face enables us to have depth perception (the ability to see the

    world in three dimensions - 3D).

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    How we see:A whole series of events happens in order for us to see something. First,

    light must reflect off an object. The light travels through the clear cornea of the eye,

    and then the lens, which focuses the light onto the retina (the sensory tissue lining the

    back of the eye). In the retina, cells called rods detect light (they are photoreceptors)

    and cones detect colors. The rods and cones convert light rays into electrical impulses

    that are relayed to the brain along the optic nerve. The brain interprets the signalsfrom the eyes and we then "see" what we are looking at.

    Definitions:

    Aqueous humor- the clear, watery fluid inside the eye. It provides nutrients to the eye.Astigmatism- a condition in which the lens is warped, causing images not to focus properly on

    the retina.

    Binocular vision- the coordinated use of two eyes which gives the ability to see the world inthree dimensions - 3D.

    Cones- cells the in the retina that sense color. People have three types of cones, L cones that

    sense long wavelengths (reds, yellows), M cones that sense medium wavelengths (greens), and S

    cones that sense medium wavelengths (violets, blues).

    Cornea- the clear, dome-shaped tissue covering the front of the eye.

    Eyebrow- a patch of dense hair located above the eye.

    Eyelash- one of the many hairs on the edge of the eyelids.

    Eyelid- the flap of skin that can cover and protect the eye.Farsighted- (also called hyperopia) a condition in which distant objects are seen more clearly

    than nearby objects because light is focused behind the retina, not on it.

    Iris- the colored part of the eye - it controls the amount of light that enters the eye by changingthe size of the pupil.

    Lens- a crystalline structure located just behind the iris - it focuses light onto the retina.

    Nearsighted- (also called myopia) a condition in which nearby objects are seen more clearlythan distant objects because light is focused in front of the the retina, not on it.

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    Optic nerve- (also called cranial nerve II) the nerve that transmits electrical impulses from theretina to the brain.

    Pupil- the opening in the center of the iris- it changes size as the amount of light changes (the

    more light, the smaller the hole).

    Retina- light-sensitive tissue that lines the back of the eye. It contains millions of

    photoreceptors (rods and cones) that convert light rays into electrical impulses that are relayed tothe brain via the optic nerve.

    Rods- cells the in the retina that sense brightness (they are photoreceptors). Night visioninvolves mostly rods (not cones). There are many more rods than cones.

    Tear- clear, salty liquid that is produced by glands in the eyes.

    Vitreous- a thick, transparent liquid that fills the center of the eye - it is mostly water and givesthe eye its form and shape (also called the vitreous humor).

    20/20 Vision- normal human vision, a condition in which a person can see a letter of a specific

    size from a distance of 20 feet.

    Label the Eye Diagram #2 Human Anatomy

    Read the definitions, then label the eye anatomy diagram below.Cornea- the clear, dome-shaped tissue covering the front of the eye.

    Eyebrow- a patch of dense hair located above the eye.

    Eyelash- one of the many hairs on the edge of the eyelids.

    Eyelid- the flap of skin that can cover and protect the eye.

    Iris- the colored part of the eye - it controls the amount of light that enters the eye by changingthe size of the pupil.

    Lens- a crystalline structure located just behind the iris - it focuses light onto the retina.

    Optic nerve- the nerve that transmits electrical impulses from the retina to the brain.

    Pupil- the opening in the center of the iris- it changes size as the amount of light changes (themore light, the smaller the hole).

    Retina- sensory tissue that lines the back of the eye. It contains millions of photoreceptors (rodsand cones) that convert light rays into electrical impulses that are relayed to the brain via theoptic nerve.

    Tear- clear, salty liquid that is produced by glands in the eyes.

    Vitreous- a thick, transparent liquid that fills the center of the eye - it is mostly water and gives

    the eye its form and shape (also called the vitreous humor).

    http://www.enchantedlearning.com/subjects/anatomy/titlepage.shtmlhttp://www.enchantedlearning.com/subjects/anatomy/titlepage.shtmlhttp://www.enchantedlearning.com/subjects/anatomy/titlepage.shtml
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    Questions regarding the Digestive System

    1. Which of the following is not part of the accessory organs in the digestive system?

    a) liver

    b) pancreas

    c) large intestines

    d) sublingual salivary gland

    2. The structure of the alimentary canal wall has 4 layers, from deep to superficial, they are

    a) mucosa, submucosa, serosa, muscularis layer

    b) mucosa, submucosa, muscularis layer, serosa

    c) mucosa, muscularis layer, submucosa, serosa

    d) mucosa, serosa, muscularis layer, submucosa

    3. The mouth is adapted to take in food from the external environment and to begin preparing it for

    a) absorption

    b) secretion

    c) reabsorption

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    d) digestion

    4. What is the function of the soft palate?

    a) to keep opening to nasal cavity open at all times

    b) to keep opening to nasal cavity open during swallowing

    c) to keep opening to nasal cavity closed during swallowing

    d) to keep opening nasal cavity closed at all times

    5. There are _______ deciduous teeth and _________ permanent teeth.

    a) 20, 30

    b) 20, 32

    c) 18, 30

    d) 18, 32

    6. Which of the following is not a function of salivary glands?

    a) start digestion of proteins

    b) helps bind food particles

    c) secrete saliva

    d) makes taste possible

    7. What are the names of the 3 salivary glands?

    a) parotid glands, submandibular glands, submaxillary glands

    b) parotid glands, submandibular glands, sublaryngeal glands

    c) parotid glands, submandibular glands, sublingual glands

    d) parotid glands, submandibular glands, subpharygneal glands

    8. Which of the following is not a function of the stomach?

    a) receives food

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    b) mixes food with gastric juice

    c) carries out limited amount of absorption

    d) moves food into the large intestine

    9. The sphincter that serves as a valve between the stomach and small intestine is

    a) cardiac sphincter

    b) pyloric sphincter

    c) glossopharygeal sphincter

    d) intestinal sphincter

    10. The regulation of gastric secretion is enhanced by

    a) stimulation of parasympathetic nervous system and the hormone gastrin

    b) stimulation of the sympathetic nervous system and the hormone gastrin

    c) inhibition of the parasympathetic nervous system and the hormone gastrin

    d) inhibition of the sympathetic nervous system and the hormone secretin

    11. The presence of food in the small intestine

    a) increase gastric secretion

    b) inhibit gastric secretion

    c) has no effect on gastric secretion

    12. Pancreatic juice contains enzymes that can split

    a) carbohydrates, proteins, fats, minerals

    b) carbohydrates, proteins, fats, nucleic acids

    c) proteins, fats, nucleic acid, water

    d) proteins, fats, nucleic acid, vitamins

    13. The names of the 2 hormones that influence pancreatic secretion are

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    a) secretin, cholecystokinin

    b) secretin, renin

    c) aldosterone, cholecystokinin

    d) vasopressin, cholecystokinin

    14. The function of the liver is to

    a) metabolize carbohydrates, lipids and proteins

    b) filtration of blood

    c) detoxification of chemicals

    d) all of the above

    15. Bile is just one of the livers many secretions that directly influence digestion.

    a) this statement is true

    b) this statement is false

    16. The components of bile include: bile salts, bile pigments, cholesterol and various electrolytes. Whichof the components in bile have digestive functions?

    a) bile salts

    b) bile pigments

    c) cholesterol

    d) all of the above

    17. Which of the following is nota function of the small intestines?

    a) receives secretions from the pancreas and liver

    b) completes digestion of nutrients

    c) absorbs products of digestion

    d) transports the residue to the anal canal

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    18. The parts of the small intestine (start with the part closest to the stomach) are

    a) duodenum, jejunum, ileum

    b) duodenum, ileum, jejunum

    c) ileum, jejunum, duodenum

    d) ileum, duodenum, jejunum

    19. Which of the following statement is false regarding absorption in the small intestines?

    a) villi increase the surface area of the intestinal wall to increase absorption

    b) monosaccharides, amino acids, fatty acids and glycerol can be absorbed by the villi

    c) fat molecules enter from the lacteals of the villi

    d) all of the above is true

    20. Which of the following statement is false regarding the function of the large intestines?

    a) the only important secretion is mucous

    b) feces are formed and stored here

    c) main absorption is water and electrolytes

    d) digestive activity remain high in the large intestines

    21. Which of the following is not a source of carbohydrates?

    a) starch

    b) amino acids

    c) glycogen

    d) disaccharides

    22. Which of the following concerning lipids is false?

    a) lipids are organic compounds that supply energy

    b) lipids are used to build cell structures

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    c) all lipids contain fat-soluble vitamins

    d) metabolism of triglycerides is controlled predominately by liver and adipose tissues

    23. Some of the functions of proteins include

    a) serves as structural material and act as enzymes

    b) provide energy

    c) a and b

    d) none of the above

    24. The digestive enzyme pepsin secreted by gastric glands begins the digestion of

    a) carbohydrates

    b) protein

    c) fat

    25. Which of the following enzymes is present in secretions of the mouth, stomach, and pancreas?

    a) amylase

    b) trypsin

    c) lipase

    d) lactase

    26. Carbohydrates are ingested in such foods as

    a) meat and seafoods

    b) bread and pasta

    c) butter and margarine

    27. Glucose can be stored as glycogen in the

    a) blood plasma

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    b) connective tissue

    c) liver

    28. Carbohydrates are acted on by

    a) peptidases, trypsin and chymotrypsin

    b) amylase, maltase and sucrase

    c) lipases

    d) peptidases, lipases and galactase

    29. The parasympathetic nervous system influences digestion by

    a) relaxing smooth muscles

    b) stimulating peristalsis and secretatory activity

    c) constricting sphincters

    d) none of these

    30. The digestive juice product containing enzymes capable of digesting all 4 major foodstuff categories is

    a) pancreatic

    b) gastric

    c) salivary

    d) biliary

    31. The site of production of cholecystokinin is

    a) the stomach

    b) the small intestine

    c) the pancreas

    d) the large intestine

    32. Which of the following is not a characteristic of the large intestine?

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    a) it is divided into ascending, transverse, and descending portions

    b) it contains abundant bacteria, some of which synthesize certain vitamins

    c) is the main absorptive site

    d) it absorbs much of the water and salts remaining in the wastes

    33. The gallbladder

    a) produces bile

    b) is attached to the pancreas

    c) stores and concentrates bile

    d) produces secretin

    Digestive SystemQuiz

    The first section of the quiz is True or False statements. Read thestatements carefullyand then click on the word TRUEor FALSEthatcomes after each statement.

    1. The job of the digestive system is to break food down so that our bodiescan use it as fuel or energy.TRUEorFALSE

    2. Your stomach is located right behind your belly button.TRUEorFALSE3. Your small intestine is approximately 20 - 25 inches long.TRUEor

    FALSE4. The Large Intestine is responsible for removing water from the

    undigested food, turning it from a liquid paste into solid waste.TRUEorFALSE

    5. The esophagus is a muscular tube that carries food from our mouth to

    our stomach.TRUEorFALSE6. Everything we eat is completely digested and used by our bodies.

    TRUEorFALSE

    This section is multiple choice. Read the question then click on theanswer you think is correct.

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    1. What is inside your stomach that helps break food down into a thickliquid paste?a)waterb)acids and enzymesc)villi

    2. What are the tiny finger-like projections called that are inside the smallintestine? These tiny finger-like projections absorb the nutrients form the

    food and send the vitamins, minerals, proteins, carbohydrates and fatsinto our bloodstream.a)esophagusb)arteriesc)villi

    3. After the food leaves our stomach it heads into which part of thedigestive system?a)esophagusb)pancreasc)small intestined)large intestine

    4. What is removed from the undigested food when it is in the LargeIntestine?a)waterb)nutrientsc)energyd)sugar

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