Flashcards in Activities of the Alimentary Canal Deck (16):
What are the 4 activities of the alimentary canal?
What is the mechanical activity mostly involving smooth muscle?
What occurs in the lumen of the digestive tract in response to the presence of food, hormonal and neural signals?
What is secretion required for?
digestion, protection and lubrication
What is the chemical breakdown of complex foodstuffs to smaller, absorbable units?
How are complex foodstuffs broken down in digestion?
Where does physical digestion occur?
mouth, small intestine and stomach
What is the transfer of the absorbable products of digestion from the digestive tract to the blood or lymph?
What are the main general layers of the digestive tract wall?
Which cells would you find in the mucosa of the digestive tract wall?
endocrine gland cells
What makes up the submucosa of the digestive tract?
larger blood and lymph vessels
nerve network (sub mucous plexus)
What makes up the muscular externa?
circular muscle layer
nerve network (myenteric plexus)
longitudinal muscle layer
What is the serosa composed of?
What happens when circular muscle contracts?
narrower and longer lumen
what happens when longitudinal muscle contracts?
shorter and fatter intestine