Q: Which equation correctly represents cardiac output ($$CO) $$and what does each variable represent?

$$CO = HR \times SV$$, where $$HR is $$heart rate and $$SV is $$stroke volume

Q: A patient has a heart rate of 80 bpm and a stroke volume of 70 mL. What is their cardiac output in liters per minute?

$$CO = 80 \times 70 = 5600 mL/$$min = 5.6 L/min

Question 1

Which of the following best describes the pathway of blood flow through the heart and major vessels, starting from the systemic veins?

Accepted Answer

Systemic veins → right atrium → right ventricle → pulmonary arteries → lungs → pulmonary veins → left atrium → left ventricle → aorta

Question 2

A patient presents with a blockage in the left anterior descending coronary artery. Which region of the heart is most likely to be affected?

Accepted Answer

Left ventricle

Question 3

Which heart valve prevents backflow of blood from the left ventricle into the left atrium?

Accepted Answer

Mitral (bicuspid) valve

Question 4

During ventricular contraction, which event occurs to prevent the atrioventricular (AV) valves from inverting into the atria?

Accepted Answer

Chordae tendineae tighten as papillary muscles contract

Question 5

Which layer of the heart wall is responsible for the contractile force of the heart?

Accepted Answer

Myocardium

Question 6

Atrial fibrillation primarily affects which chambers of the heart, and what is a major risk associated with this condition?

Accepted Answer

Atria; risk of stroke due to thrombus formation

Question 7

Which of the following best describes the function of the semilunar valves?

Accepted Answer

Prevent backflow of blood into the ventricles after ventricular contraction

Question 8

A patient experiences dizziness and tachycardia upon standing, which resolves when lying down. What is the most likely diagnosis and initial treatment?

Accepted Answer

Postural orthostatic tachycardia syndrome (POTS); increase fluid and salt intake

Question 9

Which structure is known as the pacemaker of the heart, and what is its primary function?

Accepted Answer

Sinoatrial (SA) node; initiates the electrical impulse for heart contraction

Question 10

Which of the following best explains why the left ventricle has a thicker myocardium than the right ventricle?

Accepted Answer

It pumps blood to the systemic circuit, which requires higher pressure

Question 11

Which equation correctly represents cardiac output ($$CO) $$and what does each variable represent?

Accepted Answer

$$CO = HR 	imes SV$$, where $$HR is $$heart rate and $$SV is $$stroke volume

Question 12

Which of the following statements about the autonomic innervation of the heart is correct?

Accepted Answer

Parasympathetic stimulation via the vagus nerve decreases heart rate

Question 13

A patient has a heart rate of 80 bpm and a stroke volume of 70 mL. What is their cardiac output in liters per minute?

Accepted Answer

$$CO = 80 	imes 70 = 5600 mL/$$min = 5.6 L/min

Question 14

Which of the following best describes the function of intercalated discs in cardiac muscle?

Accepted Answer

They allow rapid transmission of electrical impulses between cardiac cells

Question 15

Which anatomical structure separates the right and left sides of the heart, preventing the mixing of oxygen-rich and oxygen-poor blood?

Accepted Answer

Interventricular septum

Question 16

Which of the following is a direct result of the spiral arrangement of cardiac muscle fibers in the myocardium?

Accepted Answer

It allows the heart to twist and wring blood out more efficiently during contraction

Question 17

Which of the following best describes the role of the pericardium?

Accepted Answer

It anchors the heart and reduces friction during heartbeats

Question 18

A patient with a defective tricuspid valve would most likely experience which of the following?

Accepted Answer

Backflow of blood from the right ventricle to the right atrium during ventricular contraction

Question 19

Which of the following is the correct sequence of the heart's intrinsic conduction system?

Accepted Answer

SA node → AV node → AV bundle → bundle branches → Purkinje fibers

The Heart: Structure, Function, and Clinical Relevance

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