Question 1

Which of the following best explains why the heart is described as a 'double pump'?

Accepted Answer

It pumps blood to both the lungs and the body simultaneously, with the right side sending blood to the lungs and the left side sending blood to the systemic circulation.

Question 2

A patient has a blockage in the left anterior descending artery. Which area of the heart is most likely to be affected?

Accepted Answer

Anterior wall of the left ventricle

Question 3

Which of the following correctly matches a unique structural feature of cardiac muscle to its function?

Accepted Answer

Intercalated discs allow rapid transmission of action potentials between cells, enabling synchronized contraction.

Question 4

During the cardiac cycle, which event is responsible for the first heart sound (S1)?

Accepted Answer

Closure of the atrioventricular (AV) valves

Question 5

Which equation correctly represents the calculation of Net Filtration Pressure (NFP) at a capillary bed?

Accepted Answer

$$NFP = (HP_c + OP_i) - (OP_c + HP_i)$$

Question 6

A patient is experiencing severe blood loss. Which immediate compensatory mechanism will help maintain blood pressure?

Accepted Answer

Activation of the sympathetic nervous system causing vasoconstriction

Question 7

Which of the following best describes the function of baroreceptors in blood pressure regulation?

Accepted Answer

They detect changes in arterial wall stretch and send signals to the medulla to adjust heart rate and vessel diameter.

Question 8

Which of the following statements about the hepatic portal system is correct?

Accepted Answer

It carries nutrient-rich blood from the digestive organs to the liver before returning to the heart.

Question 9

Which of the following changes would most likely increase capillary filtration and lead to edema?

Accepted Answer

Increased capillary hydrostatic pressure

Question 10

A patient with aortic valve stenosis will most likely experience which of the following?

Accepted Answer

Increased left ventricular pressure during systole

Question 11

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

Accepted Answer

Veins operate under lower pressure and need valves to prevent backflow of blood.

Question 12

Which of the following is the correct sequence of electrical conduction in the heart?

Accepted Answer

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

Question 13

Which of the following best describes the relationship between vessel diameter and resistance to blood flow?

Accepted Answer

Resistance is inversely proportional to the fourth power of the vessel radius: $$R \propto \frac{1}{r^4}$$

Question 14

A patient’s ECG shows a prolonged PR interval. Which part of the cardiac conduction system is most likely affected?

Accepted Answer

Atrioventricular (AV) node

Question 15

Which of the following hormones increases blood pressure by increasing sodium reabsorption in the kidneys?

Accepted Answer

Aldosterone

Question 16

Which of the following best describes the effect of sympathetic stimulation on the heart?

Accepted Answer

Increases heart rate and contractility

Question 17

Which of the following is a correct statement about the direction of blood flow in the systemic circuit?

Accepted Answer

Blood flows from the left ventricle to the aorta, through the body, and returns to the right atrium.

Question 18

Which of the following best explains why capillaries are the primary site of exchange between blood and tissues?

Accepted Answer

They have thin walls and a large surface area, allowing efficient diffusion of gases, nutrients, and wastes.

Question 19

A patient with chronic hypertension is at increased risk for which of the following complications?

Accepted Answer

Left ventricular hypertrophy

Question 20

Which of the following best describes the Frank-Starling law of the heart?

Accepted Answer

The greater the stretch of the ventricular muscle fibers, the greater the force of contraction.

Cardiovascular System: Heart and Blood Vessels – Study Guide for Exam 2

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