The answer choices that are bolded are what I chose for the answers. I would lik

Question

The answer choices that are bolded are what I chose for the answers. I would like to know if any of them are incorrect, and if so, what are the correct answers. Thank you.

1) An action potential:

a. Involves the influx of positive ions to depolarize the membrane

b. Involves the influx of negative ions to depolarize the membrane

c. Is initiated by potassium ion movement

d. All of the above

2) In what way does the interior surface of a cell membrane of a resting neuron differ from the external environment? The interior is:

a. Positively charged and contains less sodium

b. Negatively charged and contains less sodium

c. Negatively charged and contains more sodium

d. Positively charged and contains more sodium

3) Resetting of the sodium channels in action potential means that:

a. Both activation and inactivation gates of the channel are closed

b. Both activation and inactivation gates of the channel are open

c. The activation gate of the channel is open and the inactivation gate of the channel is closed

d. The activation gate of the channel is closed and the inactivation gate of the channel is open

4) Subthreshold depolarization graded potentials do not trigger action potential

a. True

b. False

5) Smooth muscle fibers are electrically isolated from on another

a. True

b. False

Explanation / Answer

1) An action potential:

a. Involves the influx of positive ions to depolarize the membrane

2) In what way does the interior surface of a cell membrane of a resting neuron differ from the external environment? The interior is:

b. Negatively charged and contains less sodium

3) Resetting of the sodium channels in action potential means that:

d. The activation gate of the channel is closed and the inactivation gate of the channel is open

4) Subthreshold depolarization graded potentials do not trigger action potential

a. True

5) Smooth muscle fibers are electrically isolated from on another
b. False

smooth muscle fibers exhibit slow, synchronized contractions, the whole sheet responding to a stimulus in unison, whereas Skeletal muscle fibers are electrically isolated from one another

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