Question 1

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

Accepted Answer

Myocardium

Question 2

What is the primary function of the fibrous skeleton of the heart?

Accepted Answer

To provide structural support and electrical insulation between atria and ventricles

Question 3

Which of the following correctly describes the flow of blood through the pulmonary circuit?

Accepted Answer

Right ventricle → pulmonary arteries → lungs → left atrium

Question 4

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

Accepted Answer

Mitral (bicuspid) valve

Question 5

A patient has a defect in the intercalated discs of their cardiac muscle cells. Which of the following consequences is most likely?

Accepted Answer

Impaired electrical coupling between cardiac cells, leading to arrhythmias

Question 6

Which structure is responsible for initiating the electrical impulse that sets the heart rate?

Accepted Answer

Sinoatrial (SA) node

Question 7

If the left ventricle fails to contract effectively, which of the following will most likely occur?

Accepted Answer

Decreased systemic circulation and possible tissue hypoxia

Question 8

Which equation best represents the relationship between cardiac output ($$CO$$), heart rate ($$HR$$), and stroke volume ($$SV$$)?

Accepted Answer

$$CO = HR 	imes SV$$

Question 9

During fetal circulation, which vessel carries oxygenated blood from the placenta to the fetus?

Accepted Answer

Umbilical vein

Question 10

Which of the following is TRUE regarding the coronary circulation?

Accepted Answer

Coronary arteries branch off the base of the aorta

Question 11

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

Accepted Answer

Right ventricle and portions of the conduction system

Question 12

Which of the following statements about the pericardium is correct?

Accepted Answer

The pericardial cavity contains fluid that reduces friction during heartbeats

Question 13

Which of the following best describes the function of the atrioventricular (AV) valves?

Accepted Answer

They prevent backflow of blood from the ventricles into the atria during ventricular contraction

Question 14

Which of the following is a unique feature of cardiac muscle cells compared to skeletal muscle cells?

Accepted Answer

Intercalated discs with gap junctions and desmosomes

Question 15

If the Purkinje fibers are damaged, which of the following is most likely to occur?

Accepted Answer

Ventricular contraction will be delayed or uncoordinated

Question 16

Which of the following best explains why the heart is described as a 'dual-circuit' system?

Accepted Answer

It pumps blood to both the lungs and the rest of the body in separate circuits

Question 17

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 18

Which of the following equations correctly represents the oxygen content ($$O_2) $$delivered to tissues per minute, given cardiac output ($$CO) $$and arterial oxygen content ($$CaO_2$$)?

Accepted Answer

$$O_2 = CO$$ 	imes $$CaO_2$$

Question 19

A newborn is found to have a patent ductus arteriosus (PDA). What is the physiological consequence of this condition?

Accepted Answer

Oxygenated and deoxygenated blood mix, reducing oxygen delivery to tissues

Cardiovascular System: Structure, Function, and Circulatory Routes

Guida di studio - Domande di pratica

Study guide - Flashcard