24.13 lg intestine

Question 1

how long is an avg trip through the lg intestine?

Answer 1

18-24 hrs

Question 2

what happens generally in the lg intestine?

Answer 2

chyme is converted to feces

Question 3

what happens specifically in the lg intestine?

Answer 3

absorption of H_2O and salts
secretion of mucus
extensive action of microorganisms

Question 4

what is the initial amt of chyme entering the cecum?

Answer 4

1500 mL

Question 5

what percent of the vol of chyme is absorbed? how much feces is yeilded?

Answer 5

90% absorbed

80-150 mL of feces

Question 6

what are the secretions of the lg intestines

Answer 6

mucus
gas
vit K

Question 7

what is the fn of mucus in the lg intestine?

Answer 7

provides protection through lubrication

Question 8

how is flatus produced in the lg intestine?

Answer 8

bacterial action on particular kinds of carbs found in legumes and artificial sugars like sorbital

Question 9

how is Vit K produced?

Answer 9

bacteria in the lg intestine produce it

Question 10

what happens to the Vit K in the lg intestine once it is produced?

Answer 10

absorbed

Question 11

what is feces made of?

Answer 11

H2O
undigested food (cellulose)
microorganisms
sloughed off epithelial cells

Question 12

what causes the defecation reflex?

Answer 12

distension of the rectal wall by feces

Question 13

describe the defecation reflex?

Answer 13

smooth muscle cntx by parasympathetic stimulation

usually accompanied by voluntary mvmt of feces