Anatomy and Physiology
Chapter 20 (The Heart) with
correct answers 2025/2026
A heart murmur might be caused by
a) aortic valve insufficiency.
b) pulmonic valve insufficiency.
c) mitral valve insufficiency.
d) swirling of blood in the ventricle.
e) All of the answers are correct. - correct answerse) All of the answers are correct
An increase in the rate of action potentials from baroreceptors will trigger a reflex to
a) decrease in blood pressure.
b) decrease in heart rate.
c) increase in heart rate.
d) both decrease heart rate and decrease pressure.
e) both increase heart rate and increase pressure. - correct answersd) both decrease heart rate
and decrease pressure
,Blood flowing in the vena cava will next enter the __________.
a) left ventricle
b) right ventricle
c) left atrium
d) right atrium - correct answersd) right atrium
Blood is supplied to the left atrium by the
a) phrenic arteries.
b) right coronary artery.
c) brachiocephalic artery.
d) left coronary artery.
e) pulmonary arteries. - correct answersd) left coronary artery
Blood is supplied to the myocardium by
a) the coronary sinus.
b) contact with blood in the pumping chambers.
c) the coronary arteries.
d) arteries that branch off the subclavian arteries.
e) arteries that branch from the pulmonary arteries. - correct answersc) coronary arteries
Blood returning to the heart from the pulmonary circuit first enters the __________.
a) pulmonary valve
, b) left atrium
c) pulmonary trunk
d) right atrium - correct answersb) left atrium
Blood returning to the heart from the systemic circuit first enters the
a) conus arteriosus.
b) left atrium.
c) left ventricle.
d) right ventricle.
e) right atrium. - correct answerse) right atrium
Cardiac muscle cells and skeletal muscle cells differ in a few ways. Which of the following is not
one of them?
a) Cardiac muscle cells branch.
b) Skeletal muscle cells lack intercalated discs.
c) Cardiac muscle cells are smaller in size.
d) Cardiac muscle cells have a single, centered nucleus.
e) Cardiac muscle cells lack transverse tubules. - correct answerse) Cardiac muscle cells lack
transverse tubules.
Depolarization of the ventricles is represented on an electrocardiogram by the
a) QRS complex.
b) S wave.
c) P wave.
Chapter 20 (The Heart) with
correct answers 2025/2026
A heart murmur might be caused by
a) aortic valve insufficiency.
b) pulmonic valve insufficiency.
c) mitral valve insufficiency.
d) swirling of blood in the ventricle.
e) All of the answers are correct. - correct answerse) All of the answers are correct
An increase in the rate of action potentials from baroreceptors will trigger a reflex to
a) decrease in blood pressure.
b) decrease in heart rate.
c) increase in heart rate.
d) both decrease heart rate and decrease pressure.
e) both increase heart rate and increase pressure. - correct answersd) both decrease heart rate
and decrease pressure
,Blood flowing in the vena cava will next enter the __________.
a) left ventricle
b) right ventricle
c) left atrium
d) right atrium - correct answersd) right atrium
Blood is supplied to the left atrium by the
a) phrenic arteries.
b) right coronary artery.
c) brachiocephalic artery.
d) left coronary artery.
e) pulmonary arteries. - correct answersd) left coronary artery
Blood is supplied to the myocardium by
a) the coronary sinus.
b) contact with blood in the pumping chambers.
c) the coronary arteries.
d) arteries that branch off the subclavian arteries.
e) arteries that branch from the pulmonary arteries. - correct answersc) coronary arteries
Blood returning to the heart from the pulmonary circuit first enters the __________.
a) pulmonary valve
, b) left atrium
c) pulmonary trunk
d) right atrium - correct answersb) left atrium
Blood returning to the heart from the systemic circuit first enters the
a) conus arteriosus.
b) left atrium.
c) left ventricle.
d) right ventricle.
e) right atrium. - correct answerse) right atrium
Cardiac muscle cells and skeletal muscle cells differ in a few ways. Which of the following is not
one of them?
a) Cardiac muscle cells branch.
b) Skeletal muscle cells lack intercalated discs.
c) Cardiac muscle cells are smaller in size.
d) Cardiac muscle cells have a single, centered nucleus.
e) Cardiac muscle cells lack transverse tubules. - correct answerse) Cardiac muscle cells lack
transverse tubules.
Depolarization of the ventricles is represented on an electrocardiogram by the
a) QRS complex.
b) S wave.
c) P wave.
