Question 1

Which of the following best describes the path of blood flow through the heart, starting from the systemic veins?

Accepted Answer

Right atrium → Right ventricle → Pulmonary artery → Lungs → Pulmonary vein → Left atrium → Left ventricle → Aorta

Question 2

Which of the following statements correctly differentiates between contractile and autorhythmic cardiac cells?

Accepted Answer

Autorhythmic cells initiate and conduct action potentials, while contractile cells are responsible for the mechanical work of contraction.

Question 3

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

Accepted Answer

Closure of the atrioventricular (AV) valves

Question 4

Which equation correctly represents cardiac output ($$CO$$)?

Accepted Answer

$$CO = HR 	imes SV$$

Question 5

A patient experiences a sudden drop in blood pressure. Which physiological mechanism is most likely to restore mean arterial pressure (MAP) rapidly?

Accepted Answer

Arterial baroreceptor reflex

Question 6

Which of the following best explains why arterioles are considered the primary site of vascular resistance?

Accepted Answer

They possess a thick tunica media with smooth muscle that can change diameter significantly.

Question 7

Which of the following equations correctly describes the relationship between blood flow ($$F$$), pressure gradient ($$\Delta P$$), and resistance ($$R$$)?

Accepted Answer

$$F = \Delta P / R$$

Question 8

During exercise, how is cardiac output redistributed to meet the increased metabolic demand of skeletal muscle?

Accepted Answer

By intrinsic vasodilation in skeletal muscle arterioles and vasoconstriction in non-essential organs

Question 9

Which of the following best describes the ionic movement during the plateau phase of a contractile cardiocyte action potential?

Accepted Answer

Influx of $$Ca^{2+}$$ balanced by efflux of $$K^+$$

Question 10

Which of the following is a function of red blood cells?

Accepted Answer

Transporting oxygen from the lungs to tissues

Question 11

A patient has a mutation that impairs the function of their sinoatrial (SA) node. Which of the following is most likely to occur?

Accepted Answer

The atrioventricular (AV) node will take over as the pacemaker, resulting in a slower heart rate.

Question 12

Which of the following best describes the role of the sympathetic nervous system (SNS) in regulating arteriole resistance?

Accepted Answer

SNS stimulation causes vasoconstriction of arterioles, increasing peripheral resistance and blood pressure.

Question 13

Which of the following forces promotes filtration of fluid out of capillaries into the interstitial space?

Accepted Answer

Capillary hydrostatic pressure

Question 14

Which of the following is a structural difference between veins and arteries?

Accepted Answer

Veins contain valves to prevent backflow, while arteries do not.

Question 15

Which of the following best describes the function of the arterial baroreceptor reflex?

Accepted Answer

It maintains mean arterial pressure by adjusting heart rate and vessel diameter in response to changes in blood pressure.

Question 16

Which of the following scenarios best illustrates intrinsic control of vascular resistance?

Accepted Answer

Local accumulation of metabolic byproducts causes vasodilation in skeletal muscle during exercise.

Question 17

Which of the following best describes the process of excitation-contraction coupling in cardiac muscle?

Accepted Answer

Action potential triggers $$Ca^{2+}$$ influx, which then induces further $$Ca^{2+}$$ release from the sarcoplasmic reticulum, leading to contraction.

Question 18

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

Accepted Answer

They have a large total surface area and thin walls, facilitating diffusion.

Question 19

Which of the following best describes how venous blood is mobilized during increased cardiac output demand, such as during exercise?

Accepted Answer

By increased venous pressure and contraction of skeletal muscles, which push blood toward the heart.

Question 20

Which of the following best describes the effect of extrinsic control on arteriole radius and mean arterial pressure?

Accepted Answer

Extrinsic control, such as sympathetic stimulation, causes widespread changes in arteriole radius, thereby regulating mean arterial pressure.

Cardiovascular System: Structure, Function, and Regulation

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