Question 1

Which type of blood vessel is primarily responsible for the exchange of gases and nutrients between blood and tissues?

Accepted Answer

Capillaries

Question 2

A patient presents with inflammation of the pericardium. What is the most likely consequence of this condition?

Accepted Answer

Increased friction during heart contraction

Question 3

Which heart valve prevents backflow of blood from the right ventricle into the right atrium?

Accepted Answer

Tricuspid valve

Question 4

During which phase of the cardiac cycle are all heart valves closed and the volume of blood in the ventricles remains constant?

Accepted Answer

Isovolumetric ventricular contraction

Question 5

What is the primary function of Purkinje fibers in the heart?

Accepted Answer

Conduct action potentials to the ventricles, causing contraction

Question 6

Which of the following best describes the sequence of blood flow through the heart and major vessels?

Accepted Answer

Right atrium → right ventricle → pulmonary artery → lungs → pulmonary veins → left atrium → left ventricle → aorta

Question 7

A patient is diagnosed with third-degree heart block. Which of the following best describes the electrical activity in their heart?

Accepted Answer

Atrial and ventricular contractions are independent

Question 8

Which structure in the heart acts as the primary pacemaker, setting the rhythm for the rest of the heart?

Accepted Answer

Sinoatrial (SA) node

Question 9

Which of the following best explains why the left ventricle has a thicker wall than the right ventricle?

Accepted Answer

It pumps blood to the entire body, requiring greater force

Question 10

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

Accepted Answer

$CO = HR 	imes SV$

Question 11

A patient experiences ventricular fibrillation. What is the most immediate risk associated with this condition?

Accepted Answer

Loss of coordination of electrical activity, leading to cardiac arrest

Question 12

Which of the following statements about the AV nodal delay is correct?

Accepted Answer

It allows the atria to contract and empty blood into the ventricles before ventricular contraction

Question 13

Which component of blood is primarily responsible for transporting oxygen and carbon dioxide?

Accepted Answer

Erythrocytes

Question 14

During ventricular ejection, which valves are open?

Accepted Answer

Semilunar valves

Question 15

Which heart sound is associated with the closing of the AV valves?

Accepted Answer

First heart sound ("lubb")

Question 16

A patient has a mutation affecting the desmosomes in their myocardial cells. Which of the following is the most likely consequence?

Accepted Answer

Decreased resistance to mechanical stress during contraction

Question 17

Which of the following best describes the role of gap junctions in cardiac muscle?

Accepted Answer

They provide electrical coupling between adjacent cells

Question 18

If the pressure in the left atrium is greater than the pressure in the left ventricle, which valve will be open?

Accepted Answer

Mitral (bicuspid) valve

Question 19

Which of the following is the correct sequence for the conduction of an impulse through the heart?

Accepted Answer

SA node → AV node → Bundle of His → Purkinje fibers

Question 20

Which formula correctly represents the relationship between blood flow ($F$), pressure difference ($\Delta P$), and resistance ($R$) in the cardiovascular system?

Accepted Answer

$F = \dfrac{\Delta P}{R}$

Cardiovascular System: Cardiac Function and Heart Anatomy

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