components of the digestive system the alimentary canal digestive glands human digestive system the...
TRANSCRIPT
• 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
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
The alimentary canal
oesophagus
stomach
small intestine
large intestine
rectum
anus
Digestive glands
• salivary glands
• gastric gland
• liver
• pancreas
• intestinal gland
salivasaliva
bilebile
gastric juicegastric juice
pancreatic juicepancreatic juice
intestinal juiceintestinal juice
Human digestive system
Digestive system of a rat
large intestinesmall intestine
liverstomach
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
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
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