1. The plateau of the cardiac action potential results from the opening of volta
ID: 3516658 • Letter: 1
Question
1. The plateau of the cardiac action potential results from the opening of voltage-gated slow _____ channels in teh plasma membrane of the cardiac cell.
a. Sodium
b. potassium
c. calcium
d. chlorine
e. glucose
2. Select the CORRECT statement about veins
a. Their walls are highly muscular
b. their walls consist of one layer of cells
c. there are only about forty large ones in the body
d. they serve as a blood reservoir
e. They transport blood blood away from the heart
3. An EEP
a. occurs because of Na+ movement inward at the motor end plate region as a result of permeability changes induced by binding of acetylocholine with end-plate receptor sites
b. is usually smaller in magnitude than an EEP
c. is terminated when Ca2+ inactivates acetylcholine
d. both a and b above are correct
e. all of the above are correct
Explanation / Answer
Answer 1. The plateau of the cardiac action potential results from the opening of voltage gated slow calcium channels in the plasma membrane of the cardiac cell.
Answer 2. Correct statement about veins are- a. Their wall are highly muscular. d. They serve as blood reservoirs.
Veins transport blood towards the heart and their wall is made up of more than one layer.
Answer 3. option d that is both a and b above are correct. An EEP occur because of Na ion movement inward at the motor end plate region as a result of permeability changes induced by binding of acetylcholine with end plate receptor site. It is usually smaller in magnitude than an EEP.
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