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Components of the digestive system The alimentary canal Digestive glands Human digestive system The digestive system of a rat Peristalsis The structure

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Page 1: Components of the digestive system The alimentary canal Digestive glands Human digestive system The digestive system of a rat Peristalsis The structure
Page 2: Components of the digestive system The alimentary canal Digestive glands Human digestive system The digestive system of a rat Peristalsis The structure

• Components of the digestive system• The alimentary canal• Digestive glands• Human digestive system• The digestive system of a rat• Peristalsis• The structure and functions of a villus

Page 3: Components of the digestive system The alimentary canal Digestive glands Human digestive system The digestive system of a rat Peristalsis The structure

a tube from mouth to anusa tube from mouth to anus

The digestive system in mammals

Alimentarycanal

Alimentarycanal

Digestive glands

Digestive glands

they produce enzymes for digestion

they produce enzymes for digestion

Page 4: Components of the digestive system The alimentary canal Digestive glands Human digestive system The digestive system of a rat Peristalsis The structure

The alimentary canal

oesophagus

stomach

small intestine

large intestine

rectum

anus

Page 5: Components of the digestive system The alimentary canal Digestive glands Human digestive system The digestive system of a rat Peristalsis The structure

Digestive glands

• salivary glands

• gastric gland

• liver

• pancreas

• intestinal gland

salivasaliva

bilebile

gastric juicegastric juice

pancreatic juicepancreatic juice

intestinal juiceintestinal juice

Page 6: Components of the digestive system The alimentary canal Digestive glands Human digestive system The digestive system of a rat Peristalsis The structure

Human digestive system

Page 7: Components of the digestive system The alimentary canal Digestive glands Human digestive system The digestive system of a rat Peristalsis The structure

Digestive system of a rat

large intestinesmall intestine

liverstomach

Page 8: Components of the digestive system The alimentary canal Digestive glands Human digestive system The digestive system of a rat Peristalsis The structure

Peristalsis

• muscle in front of the food bolus relaxes

• muscle behind the food bolus contracts

food bolus is pushed along the gut

The rhythmic contraction and relaxation of the muscles of the gut wall to move food along the alimentary canal

Page 9: Components of the digestive system The alimentary canal Digestive glands Human digestive system The digestive system of a rat Peristalsis The structure

transports fats and glucose

increase surface area for absorption

one cell thickwith blood capillariesand a lacteal

Structure and function of a villus

villus

muscle wall

lacteal

Page 10: Components of the digestive system The alimentary canal Digestive glands Human digestive system The digestive system of a rat Peristalsis The structure

SummaryThe digestive system

• is the system of organs that are involved in the process of digestion

• is made up of the alimentary canal and associated glands

Movement of food along the alimentary canal

• by peristalsis

Absorption of digested food

• by villi