packet 1 part 2

Question 1

alimentary canal organs

Answer 1

from esophagus to large intestine have same 4 tissue tunic layers

Question 2

mucosa

Answer 2

innermost moist membrane layer that lines cavity/lumen of organs

Question 3

function of mucosa

Answer 3

absorption of digested food

secretion of mucus

digestive enzymes + hormones

protect against infectious diseases

Question 4

mucosa is made of

Answer 4

surface epithelium with goblet cells for secretion (except for esophagus, has strat. squa. epi.)

small amount of loose areolar CT w/ capillaries to nourish epithelium + absorb nutrients

MALT (mucosa associated lymphatic tissue) to defend against pathogens

scanty SMM layer that produces local movements of mucosa

Question 5

submucosa

Answer 5

beneath mucosa

Question 6

function of submucosa

Answer 6

vascular supply to mucosa

protection

Question 7

submucosa is made of

Answer 7

soft dense CT w/ blood/nerve vessels + lymph nodules + lymphatic vessels

elastic fibers to expand/contract stomach depending on food amt.

Question 8

muscularis externa

Answer 8

outer to submucosa

SMM layer

Question 9

function of muscularis externa

Answer 9

churning, mixing, propulsion of food along tract

Question 10

muscularis externa is made of

Answer 10

inner circular layer of SMM

outer longitudinal layer of SMM

third oblique muscle layer inner to circular (only in stomach)

Question 11

sphincters

Answer 11

valves made by thickening of circular layer

prevents backflow + controls food passage from one organ to another