$$ VO_2$ = Q \times ($$CaO_2$$ - $$CvO_2$$) $$

Question 1

Which chamber of the heart receives oxygen-poor blood from the systemic circuit?

Accepted Answer

Right atrium

Question 2

The heart is located in which region of the thoracic cavity?

Accepted Answer

Mediastinum

Question 3

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

Accepted Answer

Myocardium

Question 4

What is the primary function of the chordae tendineae?

Accepted Answer

To prevent the AV valve flaps from everting into the atria

Question 5

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

Accepted Answer

Aortic semilunar valve

Question 6

During cardiac tamponade, what is the main physiological consequence?

Accepted Answer

Compression of the heart's pumping ability due to excess fluid in the pericardial space

Question 7

Which equation best represents the relationship between pressure, volume, and flow in the cardiovascular system?

Accepted Answer

$$ Q = \frac{\Delta P}{R} $$

Question 8

Which structure is NOT found between the major veins and atria, and why is this not problematic?

Accepted Answer

Valves; because inertia of incoming blood and heart contractions compress venous openings

Question 9

Which of the following best describes the difference in wall thickness between the left and right ventricles, and its functional significance?

Accepted Answer

The left ventricle wall is three times thicker than the right, allowing it to generate greater pressure for systemic circulation

Question 10

Which vessels supply the functional blood supply to the heart muscle itself?

Accepted Answer

Coronary arteries

Question 11

A patient presents with thoracic pain due to fleeting deficiency in blood delivery to the myocardium. What is the most likely diagnosis?

Accepted Answer

Angina pectoris

Question 12

Which equation describes the relationship between cardiac output, heart rate, and stroke volume?

Accepted Answer

$$ CO = HR 	imes SV $$

Question 13

Which feature of cardiac muscle allows it to function as a single coordinated unit?

Accepted Answer

Intercalated discs with gap junctions

Question 14

Why can't tetanic contractions occur in cardiac muscle?

Accepted Answer

Cardiac muscle fibers have a longer absolute refractory period than skeletal muscle fibers

Question 15

Which of the following is TRUE regarding the coronary circulation?

Accepted Answer

Coronary arteries encircle the heart in the coronary sulcus

Question 16

Which of the following is a consequence of valvular stenosis?

Accepted Answer

Stiff flaps constrict the opening, requiring the heart to exert more force to pump blood

Question 17

Which equation best represents the relationship between oxygen consumption and cardiac muscle metabolism?

Accepted Answer

$$ VO_2$ = Q 	imes ($$CaO_2$$ - $$CvO_2$$) $$

Question 18

Which structure anchors cardiac muscle fibers and supports great vessels and valves?

Accepted Answer

Cardiac skeleton

Question 19

Which of the following statements about cardiac muscle is FALSE?

Accepted Answer

Cardiac muscle cannot function without oxygen

The Cardiovascular System: Heart Anatomy and Physiology

Study Guide - Practice Questions