Question

Q. Which is true when your sympathetic nervous system is more active?

a. the SA node depolarizes more rapidly.

b. the myocardium repolarizes more rapidly.

c. more Ca2+ becomes available and causes more forceful heart cotractions.

d. norepinephrines is stimulation the heart.

e. all of these.

True / False

1. Atrial systole contributes most of a ventricle's EDV.

2. The extent of ventrcular filling is the preload of the heart, whereas the magnitude of the arterial blood pressure is the afterload of the heart.

3. According to the Frank-Starliing law of the heart, the shorter the initial length of the cardiac muscle fiber prior to contraction, the more forceful will be the subsequent contraction because the fibers are already partially contracted.

Answer 1

Q. Which is true when your sympathetic nervous system is more active?

a. the SA node depolarizes more rapidly.

b. the myocardium repolarizes more rapidly.

c. more Ca2+ becomes available and causes more forceful heart cotractions.

d. norepinephrines is stimulation the heart.

e. all of these.

True / False

1. Atrial systole contributes most of a ventricle's EDV. -  FALSE

2. The extent of ventrcular filling is the preload of the heart, whereas the magnitude of the arterial blood pressure is the afterload of the heart. TRUE

3. According to the Frank-Starliing law of the heart, the shorter the initial length of the cardiac muscle fiber prior to contraction, the more forceful will be the subsequent contraction because the fibers are already partially contracted. False