Question 1

Which layer of the heart is primarily responsible for its contractile function, and what is its main tissue type?

Accepted Answer

The myocardium; composed mainly of cardiac muscle tissue

Question 2

During the cardiac cycle, which event directly follows ventricular systole?

Accepted Answer

Ventricular diastole

Question 3

Which of the following best describes the role of calcium ions ($$\mathrm{Ca$$^{2+}$$}) in $$cardiac muscle contraction?

Accepted Answer

They bind to troponin, allowing actin-myosin cross-bridge formation

Question 4

A patient has a stroke volume of $$70\ \mathrm{mL}$$ and a heart rate of $$80\ \mathrm{beats/min}. $$What is their cardiac output?

Accepted Answer

$$5600\ \mathrm{mL/min}$$

Question 5

Which blood vessel type is most responsible for regulating blood pressure and flow to specific tissues?

Accepted Answer

Arterioles

Question 6

If a person experiences vasoconstriction, what is the expected effect on blood pressure?

Accepted Answer

Blood pressure increases due to decreased vessel diameter

Question 7

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

Accepted Answer

Diffusion across capillary walls

Question 8

A patient with type A blood receives type B blood during a transfusion. What is the most likely outcome?

Accepted Answer

Agglutination and hemolysis due to ABO incompatibility

Question 9

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

Accepted Answer

$$F = \Delta P / R$$

Question 10

Which of the following is a major function of plasma proteins?

Accepted Answer

Maintaining osmotic pressure

Question 11

Which organ is primarily responsible for the breakdown and recycling of old red blood cells?

Accepted Answer

Spleen

Question 12

Which white blood cell type is most abundant and primarily responsible for phagocytosis of bacteria?

Accepted Answer

Neutrophils

Question 13

Which sequence correctly describes the events of hemostasis following a blood vessel injury?

Accepted Answer

Vasoconstriction, platelet plug formation, coagulation

Question 14

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 systemic circulation, which requires higher pressure

Question 15

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

Accepted Answer

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

Question 16

Which factor would most likely increase stroke volume during exercise?

Accepted Answer

Increased contractility of the heart

Question 17

A patient with chronic kidney disease has reduced erythropoietin production. What is the most likely consequence?

Accepted Answer

Decreased red blood cell count (anemia)

Question 18

Which of the following best describes the function of platelets in the blood?

Accepted Answer

Initiating blood clotting

Question 19

Which physiological mechanism is most important for maintaining blood pressure during acute blood loss?

Accepted Answer

Activation of the vasomotor center causing vasoconstriction

Question 20

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

Accepted Answer

Increased heart rate and contractility

Cardiovascular and Blood System: Anatomy & Physiology Study Guide

Study Guide - Practice Questions