Miscellaneous

Question 1

What effect does hypercalcemia have on the membrane potential?

Answer 1

raises threshold for action potential and decreases excitability

(Ca++ binds to negatively charged proteins making cell think it is more positive than it actually is)

Question 2

Effect of hypocalcemia on membrane potential?

Answer 2

increases excitability and lowers threshold for action potential

Question 3

Does hyperventilation cause increased or decreased neuronal membrane excitability?

Answer 3

INCREASED

blow off more acid –> lower Ca++

Question 4

Does hypoventilation cause increased or decreased neuronal membrane excitability?

Answer 4

decreased

accumulate more CO2 –> higher Ca++

Question 5

What role does calcium play in neurotransmission?

Answer 5

It enters the cell once its channels are voltage activated and it facilitates binding of the vesicles to the membrane for neurotransmitter release

Question 6

True or false: Hypercalcemia has the opposite effect of hyperkalemia on resting membrane potential?

Answer 6

False (hypercalcemia –> decreases membrane excitability as does hyperkalemia)

Question 7

What kind of muscle is NOT controlled by the ANS?

Answer 7

skeletal