movement of food thru git

Question 1

causes of tonic contraction (3)

Answer 1

1-repetitive spike potentials 2-cont depol by hormones 3-cont entry of ca++

Question 2

fxn of submucosal plexus (2)

Answer 2

1-controls blood flow & secretions 2-receives sensory impulses from git epithelium & gut wall

Question 3

what do afferents of sensory nervous system pass to? (3)

Answer 3

1-enteric n.s 2-prevertebral ganglia 3-cns

Question 4

what do the afferents of sensory n.s travel thru?

Answer 4

1-enteric n.s (symp) 2-prevertebral ganglia (symp) 3-cns (brain stem-vagi;spinal cord;symp)

Question 5

fxn of sensory n.s? (2)

Answer 5

1-elicits local reflexes within gut 2-elicits reflexses that involve prevertebral ganglia/cs

Question 6

e.g. of local reflexes? (3)

Answer 6

peristalsis, secretion of juice, mixing

Question 7

where do pregang symp fibers originate from?

Answer 7

t5-l2 seg of s.cord

Question 8

what is the stimulus for gip secretion?

Answer 8

aa + f.a.

Question 9

list git vasodilators (7)

Answer 9

cck, vip, gastrin, secretin, kallidin bradykinin, adenosine