GI Part 7- 3

Question 1

What are slow, undulating changes in the resting membrane protein Al of the muscle cells? Rhythm is determines the rhythm of GI tract contractions?

Answer 1

Slow waves

Question 2

Spike potentials are _____ action potentials

Answer 2

True

Question 3

What occurs automatically when the resting membrane potential of the GI smooth muscle becomes more positive than -40mV?

Answer 3

Spike potentials

Question 4

What waves originate in specialized smooth muscle cells called interstitial cells of Cajal?

Answer 4

Slow waves

Question 5

What cells are believed to be the “electrical pacemakers” for smooth muscle cells?

Answer 5

ICC

Question 6

ICC form a network with each other and are interposed between ______ muscle cells

Answer 6

Smooth

Question 7

ICC under _____ changes in membrane potential due to unique ion channels that periodically open and produce currents

Answer 7

Cyclic

Question 8

The higher the slow wave potential rises, the ________ the frequency of the spike potentials

Answer 8

Greater

Question 9

Slow waves will only induce an action potential when they reach smooth muscle cells that were _________ sensitized

Answer 9

Previously

Question 10

Stimuli for ____________:
Stretching
ACh released by the PSNS
GI hormones

Answer 10

Depolarization

Question 11

Stimuli for ______________:
NEPI and EPI

Answer 11

Hyperpolarization