Question 1

Which of the following best describes the function of the interventricular septum in the heart?

Accepted Answer

It separates the left and right ventricles, preventing the mixing of oxygenated and deoxygenated blood.

Question 2

A patient presents with a heart murmur detected between the first and second heart sounds. Which valve is most likely affected?

Accepted Answer

Mitral (bicuspid) valve

Question 3

According to the Frank-Starling mechanism of the heart, which of the following is true?

Accepted Answer

The force of contraction increases with increased venous return.

Question 4

Which of the following vessels supplies blood to the myocardium?

Accepted Answer

Coronary arteries

Question 5

During which phase of the cardiac cycle are both the atrioventricular (AV) and semilunar valves closed?

Accepted Answer

Isovolumetric contraction

Question 6

Which of the following is the correct sequence of structures that a drop of blood passes through as it travels from the right atrium to the left ventricle?

Accepted Answer

Right atrium → tricuspid valve → right ventricle → pulmonary valve → pulmonary artery → lungs → pulmonary vein → left atrium → mitral valve → left ventricle

Question 7

Which of the following best describes the QRS complex on an ECG?

Accepted Answer

Ventricular depolarization

Question 8

A patient has a heart rate of 125 beats per minute. This condition is best described as:

Accepted Answer

Tachycardia

Question 9

Which of the following statements about cardiac muscle cells is true?

Accepted Answer

They are connected by gap junctions that allow rapid transmission of action potentials.

Question 10

Which of the following is the best explanation for why tetanic contractions do not occur in normal cardiac muscle?

Accepted Answer

The refractory period in cardiac muscle is long, preventing summation of contractions.

Question 11

Which of the following best describes the role of the sinoatrial (SA) node?

Accepted Answer

It initiates the electrical impulse that sets the pace for the heart rate.

Question 12

Which of the following is the correct formula for cardiac output ($$CO$$)?

Accepted Answer

$$CO = HR 	imes SV$$

Question 13

Which of the following would most likely increase stroke volume?

Accepted Answer

Increased contractility of the ventricular myocardium

Question 14

Which of the following best describes the function of the chordae tendineae?

Accepted Answer

They prevent the atrioventricular valves from inverting into the atria during ventricular contraction.

Question 15

Which of the following is a direct effect of sympathetic stimulation on the heart?

Accepted Answer

Increased force of contraction

Question 16

Which of the following best describes the relationship between end-diastolic volume (EDV), end-systolic volume (ESV), and stroke volume (SV)?

Accepted Answer

$$SV = EDV - ESV$$

Question 17

Which of the following is the primary pacemaker of the heart?

Accepted Answer

Sinoatrial (SA) node

Question 18

Which of the following best describes the effect of acetylcholine on the heart?

Accepted Answer

It decreases heart rate by increasing potassium permeability in pacemaker cells.

Question 19

Which of the following is true regarding the cardiac cycle?

Accepted Answer

Ventricular systole occurs after atrial systole.

Question 20

Which of the following best describes the function of the coronary arteries?

Accepted Answer

They supply oxygenated blood to the myocardium.

Comprehensive Study Guide: Cardiovascular System (Anatomy & Physiology)

Guida di studio - Domande di pratica

Study guide - Flashcard