Q: Which of the following equations correctly represents the percentage of blood volume made up of red blood cells (hematocrit)?

$$\text{Hematocrit} = \frac{\text{Volume of red blood cells}}{\text{Total blood volume}} \times 100$$

Question 1

Which of the following best describes the function of the fibrous pericardium?

Accepted Answer

It acts as a dense irregular connective tissue layer that anchors the heart to surrounding structures and prevents overfilling.

Question 2

A patient is diagnosed with pericarditis, an inflammation of the pericardium. Which of the following complications is most likely to occur if the pericardial cavity fills with excess fluid?

Accepted Answer

Compression of the heart, restricting its ability to expand and fill with blood

Question 3

Which layer of the heart wall is primarily responsible for the contractile force that pumps blood?

Accepted Answer

Myocardium

Question 4

During the cardiac cycle, which valve prevents backflow of blood from the left ventricle to the left atrium?

Accepted Answer

Bicuspid (mitral) valve

Question 5

Which of the following best explains why the left ventricular wall is thicker than the right ventricular wall?

Accepted Answer

It pumps blood to the entire systemic circulation, requiring greater force.

Question 6

A blockage in the right coronary artery would most directly affect which part of the heart's conduction system?

Accepted Answer

Sinoatrial (SA) node

Question 7

Which of the following statements about arteries and veins is correct?

Accepted Answer

Arteries carry blood away from the heart, regardless of oxygenation status.

Question 8

A patient has a defect in the tunica intima of their arteries. Which of the following is a likely consequence?

Accepted Answer

Increased risk of atherosclerosis due to fat deposits in the damaged layer

Question 9

Which of the following best describes the function of the cardiac fibrous skeleton?

Accepted Answer

It separates the atria and ventricles, provides structural support, and prevents simultaneous contraction of both.

Question 10

Which of the following equations correctly represents the percentage of blood volume made up of red blood cells (hematocrit)?

Accepted Answer

$$	ext{Hematocrit} = \frac{	ext{Volume of red blood cells}}{	ext{Total blood volume}} 	imes 100$$

Question 11

A newborn is found to have a patent foramen ovale. What is the most likely physiological consequence?

Accepted Answer

Oxygenated blood from the left atrium mixes with deoxygenated blood in the right atrium.

Question 12

Which of the following is a correct sequence of blood flow through the adult systemic circulation?

Accepted Answer

Left ventricle → aorta → body tissues → superior/inferior vena cava → right atrium

Question 13

Which of the following best describes the role of albumin in plasma?

Accepted Answer

It helps control tissue water balance by maintaining osmotic pressure.

Question 14

A patient with a deficiency in megakaryocytes would most likely experience which of the following symptoms?

Accepted Answer

Impaired blood clotting

Question 15

Which of the following statements about capillaries is correct?

Accepted Answer

They are composed of a single layer of endothelium and a basement membrane.

Question 16

Which of the following best explains why veins have valves, but arteries do not?

Accepted Answer

Veins carry blood at lower pressure and need valves to prevent backflow.

Question 17

Which of the following is a function of the Purkinje fibers in the heart?

Accepted Answer

Transmit electrical signals rapidly through the ventricles to coordinate contraction

Question 18

A patient with a mutation that prevents the formation of gap junctions in cardiac muscle cells would most likely experience which of the following?

Accepted Answer

Impaired electrical signal propagation between cardiac cells

Question 19

Which of the following best describes the difference between granulocytes and agranulocytes?

Accepted Answer

Granulocytes contain visible protein granules in their cytoplasm, while agranulocytes do not.

Question 20

Which of the following equations correctly represents the calculation of blood viscosity relative to water?

Accepted Answer

$$	ext{Blood viscosity} = \frac{	ext{Viscosity of blood}}{	ext{Viscosity of water}}$$

Cardiovascular System: Structure, Function, and Blood Composition

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