Electrical Activity of GIT

Question 1

What causes a Slow wave?

Answer 1

ICC

Question 2

The slow wave doesn’t cause contraction except in ____________________.

Answer 2

Stomach

Question 3

How are slow waves and spike potentials related?

Answer 3

Slow waves trigger spike potentials

Question 4

What is a slow wave?

Answer 4

A slow wave is not an action potential

Question 5

What is the RMP in a slow wave?

Answer 5

5 to 10 mV

Question 6

What is the frequency of slow waves in the stomach?

Answer 6

3 minutes

Question 7

What is the frequency of slow waves in the duodenum?

Answer 7

12 minutes

Question 8

What is the frequency of slow waves in the 4tterminal ileum?

Answer 8

8 or 9 minutes

Question 9

Explain how Spike potential occurs.

Answer 9

normal RMP: -50 to -60 mV
When the RMP temporarily reaches -40mV, the calcium-sodium potential opens allowing for the entry of a great number of calcium and small amounts of sodium. This hence initiates muscle contraction.

Question 10

These are TRUE action potentials

Answer 10

Spike potential