Question

In: Anatomy and Physiology

Please answer the multiple choice -- please explain too! 1. As ventricular pressure increases during systole,...

Please answer the multiple choice -- please explain too!

1. As ventricular pressure increases during systole, the volume of blood in the ventricle....

a. increases

b. decreases

2. Which of these is FALSE about the ejection of blood from the left ventricle?

a. the pulmonary semilunar valve is open

b. the bicuspid valve is closed

c. the aortic semilunar valve is closed

d. the tricuspid valve is closed

3. During action potentials in the heart,

a. voltage-gated K+ channels slowly repolarize; voltage-gated Na+ channels slowly depolarize; voltage-gated calcium channels quickly depolarize; voltage gated K+ channels slowly repolarize

b. voltage-gated K+ channels quickly repolarize; voltage-gated Na+ channels quickly depolarize; voltage-gated calcium channels quickly depolarize; voltage gated K+ channels quickly repolarize

c. voltage-gated K+ channels quickly repolarize; voltage-gated Na+ channels slowly depolarize; voltage-gated calcium channels slowly depolarize; voltage gated K+ channels quickly repolarize

d. voltage-gated K+ channels quickly repolarize; voltage-gated Na+ channels quickly depolarize; voltage-gated calcium channels slowly depolarize; voltage gated K+ channels quickly repolarize

Expert Solution

1. Option B stands correct.

As ventricular pressure increases during systole, the volume of blood in the ventricle decreases because due to ventricular systole, the blood from ventricle enter into Pulmonary artery aorta through semilunar valves. Thus, the ventricular volume decreases at the end of systole.

2. Option C stands correct.

During ejection of blood from both right and left ventricle the following events takes place:

Atrioventricular valves are closed i.e., tricuspid and bicuspid valves are closed whereas semilunar valves are opened i.e., pulmonary and aortic semilunar valves.

3. Option D stands correct.

Voltage gated K⁺ channels quickly repolarize, voltage gated Na⁺ channels quickly depolarize, voltage gated Ca⁺² channels slowly depolarize, voltage gated K⁺ channels quickly repolarize. During an action potential in the heart there will be a rapid activation of voltage-gated Na⁺ channels resulting in depolarization followed by opening of voltage gated Ca⁺² channels which causes sustained depolarization (slow depolarization). Later opening of voltage gated K⁺ channels results in the quick repolarization of heart thus completing an action potential and returns to resting membrane potential of of -90 mV.

Sydney Mullin answered 1 year ago

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