Question 1

Which vessel is primarily responsible for supplying oxygenated blood to the left ventricle of the heart?

Accepted Answer

Left anterior descending artery

Question 2

Which vessel collects deoxygenated blood from the myocardium and returns it to the right atrium?

Accepted Answer

Coronary sinus

Question 3

A blockage in the right coronary artery would most likely affect which part of the heart?

Accepted Answer

Posterior wall of the right ventricle

Question 4

Which of the following best describes the difference between cardiac muscle and skeletal muscle?

Accepted Answer

Cardiac muscle cells are branched and connected by intercalated discs

Question 5

Which vessel supplies the majority of the blood to the interventricular septum?

Accepted Answer

Left anterior descending artery

Question 6

Smooth muscle differs from cardiac muscle in which of the following ways?

Accepted Answer

Smooth muscle lacks intercalated discs and is not striated

Question 7

If the left circumflex artery is blocked, which region of the heart is most likely to be affected?

Accepted Answer

Lateral wall of the left ventricle

Question 8

Which of the following equations correctly represents the relationship between cardiac output ($CO$), heart rate ($HR$), and stroke volume ($SV$)?

Accepted Answer

$CO = HR 	imes SV$

Question 9

Which vessel drains most of the blood from the anterior surface of the heart?

Accepted Answer

Great cardiac vein

Question 10

A patient presents with ischemia in the posterior interventricular septum. Which vessel is most likely occluded?

Accepted Answer

Posterior descending artery (PDA)

Question 11

Which of the following is a unique feature of cardiac muscle compared to both skeletal and smooth muscle?

Accepted Answer

Presence of intercalated discs

Question 12

Which vessel supplies the right atrium and right ventricle with oxygenated blood?

Accepted Answer

Right coronary artery

Question 13

Which of the following best explains why cardiac muscle can contract rhythmically without neural input?

Accepted Answer

Cardiac muscle cells contain pacemaker cells that generate action potentials

Question 14

Which of the following is NOT a vessel that drains deoxygenated blood from the heart muscle?

Accepted Answer

Left coronary artery

Question 15

During a myocardial infarction affecting the anterior wall of the left ventricle, which artery is most likely blocked?

Accepted Answer

Left anterior descending artery

Question 16

Which of the following statements about the coronary circulation is correct?

Accepted Answer

The left coronary artery branches into the circumflex and left anterior descending arteries

Question 17

Which of the following is a function of the intercalated discs in cardiac muscle?

Accepted Answer

They allow rapid transmission of electrical impulses between cells

Question 18

Which vessel is most likely to be involved in a heart attack affecting the lateral wall of the left ventricle?

Accepted Answer

Circumflex artery

Question 19

Which of the following best describes the role of the coronary sinus?

Accepted Answer

It drains deoxygenated blood from the myocardium into the right atrium

Question 20

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

Accepted Answer

Aorta $\rightarrow$ Left coronary artery $\rightarrow$ Myocardium $\rightarrow$ Great cardiac vein $\rightarrow$ Coronary sinus $\rightarrow$ Right atrium

Coronary Circulation and Cardiac Muscle: Structure and Function

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