Question 1

Which layer of the heart is primarily responsible for the contractile force that pumps blood throughout the body?

Accepted Answer

Myocardium

Question 2

A patient presents with a wound that admits air into the pleural cavity, resulting in a collapsed lung. What is the most accurate term for this condition?

Accepted Answer

Pneumothorax

Question 3

Which equation correctly calculates Mean Arterial Pressure (MAP) using systolic and diastolic blood pressure?

Accepted Answer

$MAP = DBP + \frac{1}{3} (SBP - DBP)$

Question 4

During ventricular systole, which event occurs in the cardiac cycle?

Accepted Answer

The ventricles contract and eject blood into the arteries

Question 5

A patient with right-sided heart failure is most likely to exhibit which clinical sign?

Accepted Answer

Peripheral edema

Question 6

Which of the following best describes the role of surfactant in the alveoli?

Accepted Answer

It decreases the surface tension to prevent alveolar collapse

Question 7

Which of the following is the correct formula for cardiac output?

Accepted Answer

$CO = SV 	imes HR$

Question 8

A patient is experiencing distributive shock due to a severe allergic reaction. Which type of shock is this?

Accepted Answer

Anaphylactic shock

Question 9

Which of the following factors will most directly increase resistance in a blood vessel?

Accepted Answer

Decreased vessel diameter

Question 10

Which structure prevents food from entering the trachea during swallowing?

Accepted Answer

Epiglottis

Question 11

Which phase of the cardiac action potential is characterized by rapid depolarization due to sodium influx?

Accepted Answer

Phase 0

Question 12

Which of the following is a function of the AV node in the cardiac conduction system?

Accepted Answer

Delays the electrical impulse to allow ventricular filling

Question 13

Which of the following best describes the effect of increased temperature on the oxygen-hemoglobin dissociation curve?

Accepted Answer

Shifts the curve to the right, decreasing hemoglobin's affinity for oxygen

Question 14

Which of the following is the most adjustable variable affecting blood flow resistance?

Accepted Answer

Vessel diameter

Question 15

A patient with a collection of blood in the pleural space following chest trauma is diagnosed with:

Accepted Answer

Hemothorax

Question 16

Which of the following best describes the function of the sympathetic nervous system on arterial smooth muscle?

Accepted Answer

It causes vasoconstriction, increasing blood pressure

Question 17

Which of the following is the correct definition of pulse pressure?

Accepted Answer

$Pulse\ Pressure = SBP - DBP$

Question 18

Which fetal circulatory adaptation allows blood to bypass the lungs by connecting the pulmonary artery to the aorta?

Accepted Answer

Ductus arteriosus

Question 19

Which of the following best explains why negative pressure is important in the pleural cavity?

Accepted Answer

It keeps the lungs inflated by maintaining a pressure lower than atmospheric pressure

Question 20

Which of the following is the primary function of the phrenic nerve?

Accepted Answer

It controls the diaphragm for respiration

Cardiovascular and Respiratory Systems: Anatomy & Physiology Study Guide

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