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Chapter 20: Digestive System. Chapter 21: Urinary System. Functions of Digestion. Ingest food Break down food in to small molecules: Mechanical digestion- Chemical digestion – Absorption Elimination. Carbohydrates. Include sugars and their polymers Monomer is the monosaccharide - PowerPoint PPT Presentation
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Chapter 20: Digestive System
Chapter 21: Urinary System
Functions of Digestion Ingest food Break down food in to small
molecules: Mechanical digestion- Chemical digestion –
Absorption Elimination
Carbohydrates Include sugars and their polymers Monomer is the monosaccharide Include 3 – 7 carbons with the –OH
group being present on each carbon except one, which is double bonded to an oxygen (carbonyl group)
Lipids A group of polymers that have
one characteristic in common, they do not mix with water. They are hydrophobic.
Some important groups are fats, phospholipids, and steroids.
Enzymes Increase speed of
chemical reactions - catalyst
A protein Can change
shape if conditions are not favorable.
Alimentary Canal Hollow tube that begins at the mouth,
ends at the anus Mouth Pharynx Esophagus Stomach Small intestine Large intestine Rectum
A. Mouth Forms a bolus Chemical digestion
– mucous, amylase (break down carbs)
Mechanical digestion: chewing
• Roof of mouth: Hard palate Soft palate
Tongue and Taste Lingual frendulum
– attaches tongue to floor of mouth
Taste buds: Papillae:
elevations on tongue
Salivary Glands Saliva – water
mucous, amalase Parotid – front of
and below ears. (mumps)
Sublingual submandibular
B.Pharynx Region between mouth and
esophagus “throat” Function – swallowing Epiglottis – blocks larynx Uvula – back of throat
C. Esophagus3. Lined by mucous
membrane and smooth muscle
4. Peristalsis – involuntary contraction of esophagus
5. Heartburn – (acid reflux)
Esophagus Continued
D. Stomach Stores food and
digests protein Rugae – folds
inside stomach Ulcers
Stomach Continued Gastric Juice –
produces Chyme Pepsin – enzyme that
digests protein HCL – kills bacteria,
breaks down food, Intrinsic factor –
absorption of B12. Mucous – softens food Gastrin – hormone
that causes gastric juice to be released.
E. Small Intestine Function- receives secretions from
the liver, pancreas and absorption of nutrients.
Lined with Villi – furry looking, absorption, increase surface area
F. Large Intestine Function – absorb
water, produce feces
E.coli bacteria present
Disorders of Large Intestine
Diarrhea – Constipation – Appendicitis – Diverticuloisis – colon cancer
Colonoscopy
Part 2: Digestive System
Accessory organs – food does not pass through
1. Pancreas Secretes Sodium Bicarbonate and
enzymes to digest carbohydrates, proteins, and fats
2. Liver – Largest gland Storage of glucose as
glycogen Destruction of old red
blood cells – this creates bilirubin
Production of bile Plasma proteins Detoxification of blood Storage of iron and
other vitamins
Liver Lobule Anatomy Functional unit of
the liver. Blood travels from
small intestine – hepatic portal vein – to various liver lobules.
3. Liver Disorders Hepatitis – inflammation of the
liver due to contaminated drinking water, sexual transmission, or blood transfusion
Cirrhosis of liver Cirrhosis – chronic
disease due to excessive amount of alcohol. Liver becomes fatty tissue.
Jaundice Jaundice –
yellowish tint due to large amounts of bilirubin in blood.
C. Gallbladder Storage of bile – emulsifies fats
and neutralize acids
Chapter 21
Excretory system
Structures of Urinary System
1. 2 kidneys 2. 2 ureters –
tube that leads to bladder
3. Bladder – stores urine
4. Urethra – tube for eliminating urine
Structure of Kidney Renal cortex –
outer layer, filtration Renal medulla –
middle layer, filtration, absorption
Renal pelvis – urine collection and transport
Renal artery - Renal vein -
Functions of Kidney
I.
Kidney Function – filter blood that has collected wastes from cells.
A. Excrete waste – urea, uric acid, creatine, ammonium
B. Maintain blood volume – regulating water excretion
C. monitor electrolytes in blood D. monitor blood pH E. secrete Renin – enzyme to help
maintain blood pressure F. stimulates red blood cell production
Lipids A group of polymers that have
one characteristic in common, they do not mix with water. They are hydrophobic.
Some important groups are fats, phospholipids, and steroids.