Q: A patient is found to have a tidal volume of 500 mL and a respiratory rate of 12 breaths per minute. What is the patient's minute ventilation ($$MV$$)?

$$MV = 500 \times 12 = 6000 mL/$$min

Question 1

A patient is experiencing difficulty breathing due to a blockage in the trachea. Which structure is immediately inferior to the trachea and would be affected next if the blockage progresses downward?

Accepted Answer

Bronchi

Question 2

According to Boyle's Law, what happens to the pressure inside the lungs as the volume of the thoracic cavity increases during inspiration?

Accepted Answer

Decreases

Question 3

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

Accepted Answer

Reduce surface tension to prevent alveolar collapse

Question 4

A nurse is monitoring a patient with metabolic acidosis. The patient begins to breathe abnormally deep and rapid. What is this breathing pattern called?

Accepted Answer

Hyperpnea

Question 5

Which law states that the total pressure exerted by a mixture of gases is the sum of the partial pressures of the individual gases?

Accepted Answer

Dalton's Law

Question 6

A patient with pulmonary fibrosis has thickened respiratory membranes. Which physiological process is most directly impaired?

Accepted Answer

Oxygen diffusion from alveoli to blood

Question 7

Which structure is a shared passageway for both the respiratory and digestive systems?

Accepted Answer

Pharynx

Question 8

The majority of oxygen transported in the blood is bound to which molecule?

Accepted Answer

Hemoglobin in red blood cells

Question 9

Which component of the cardiac conducting system is responsible for distributing the electrical stimulus to the ventricular myocardium, leading to rapid depolarization?

Accepted Answer

Purkinje fibers

Question 10

On an electrocardiogram (ECG), the QRS complex primarily represents which electrical event?

Accepted Answer

Ventricular depolarization

Question 11

Compared to veins, arteries have a relatively thicker layer of which tissue?

Accepted Answer

Tunica media

Question 12

Which vessel type typically contains valves to prevent the backflow of blood?

Accepted Answer

Veins

Question 13

A patient is diagnosed with an arrhythmia where the SA node is not functioning, and the AV node has taken over as the primary pacemaker. The nurse would expect the heart rate to be approximately:

Accepted Answer

40-60 bpm

Question 14

Which of the following is the most important skeletal muscle involved in normal, quiet breathing?

Accepted Answer

Diaphragm

Question 15

Which of the following best describes the condition of a lower-than-normal amount of oxygen in the tissues?

Accepted Answer

Hypoxia

Question 16

A patient with a congenital Ventricular Septal Defect (VSD) has an opening between the two ventricles. This causes blood to be ejected from the more powerful left ventricle into the:

Accepted Answer

Right ventricle

Question 17

Which law can be used to calculate the rate of gas diffusion across the respiratory membrane, given the surface area, thickness, and partial pressure difference?

Accepted Answer

Fick's Law: $$J = -D \frac{\Delta P}{\Delta x}$$

Question 18

The volume of air that remains in the lungs even after a maximal exhalation is the:

Accepted Answer

Residual Volume

Question 19

Which of the following is the correct formula for calculating cardiac output ($$CO$$)?

Accepted Answer

$$CO = HR 	imes SV$$

Question 20

A patient is found to have a tidal volume of 500 mL and a respiratory rate of 12 breaths per minute. What is the patient's minute ventilation ($$MV$$)?

Accepted Answer

$$MV = 500 	imes 12 = 6000 mL/$$min

Anatomy & Physiology Study Guide: Respiratory, Cardiovascular, and Lymphatic Systems

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