Q: A patient has a tidal volume of 500 mL and a respiratory rate of 12 breaths per minute. What is their minute ventilation?

$Minute\ Ventilation = Tidal\ Volume \times Respiratory\ Rate = 500\ mL \times 12 = 6000\ mL/min$

Question 1

A patient’s blood pressure is measured as 140/90 mmHg. What is their mean arterial pressure (MAP)? Use the formula $MAP = \frac{1}{3}(SBP - DBP) + DBP$.

Accepted Answer

$MAP = \frac{1}{3}(140 - 90) + 90 = \frac{1}{3}(50) + 90 = 16.67 + 90 = 106.67$ mmHg

Question 2

Which structure does air pass through immediately after the larynx during inhalation?

Accepted Answer

Trachea

Question 3

Which of the following is the primary muscle responsible for inspiration during quiet breathing?

Accepted Answer

Diaphragm

Question 4

A patient’s ECG shows a prominent QRS complex. What does this indicate?

Accepted Answer

Ventricular depolarization

Question 5

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

Accepted Answer

Reduces surface tension to prevent alveolar collapse

Question 6

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

Accepted Answer

Tricuspid valve

Question 7

During forced expiration, which muscles are primarily involved?

Accepted Answer

Internal intercostals and abdominal muscles

Question 8

A patient has a tidal volume of 500 mL and a respiratory rate of 12 breaths per minute. What is their minute ventilation?

Accepted Answer

$Minute\ Ventilation = Tidal\ Volume 	imes Respiratory\ Rate = 500\ mL 	imes 12 = 6000\ mL/min$

Question 9

Which of the following structures is lined by pseudostratified ciliated columnar epithelium?

Accepted Answer

Trachea

Question 10

Which vessel carries oxygenated blood from the lungs to the heart?

Accepted Answer

Pulmonary vein

Question 11

Which of the following is NOT a function of alveolar macrophages?

Accepted Answer

Secretion of surfactant

Question 12

A patient’s SpO$_2$ reading is 92%. What does this indicate?

Accepted Answer

Below normal oxygen saturation; possible hypoxemia

Question 13

Which of the following best describes the role of the epiglottis during swallowing?

Accepted Answer

Prevents food from entering the trachea

Question 14

Which chamber of the heart receives blood from the superior and inferior vena cava?

Accepted Answer

Right atrium

Question 15

Boyle’s Law is important in understanding pulmonary ventilation. Which equation correctly represents Boyle’s Law?

Accepted Answer

$P_1 V_1 = P_2 V_2$

Question 16

Which of the following is the correct order of airflow from the external environment to the alveoli?

Accepted Answer

Nasal cavity → Pharynx → Larynx → Trachea → Bronchi → Bronchioles → Alveoli

Question 17

Which of the following is a primary function of the larynx?

Accepted Answer

Voice production

Question 18

Which of the following best explains why carbonic acid is important in the respiratory system?

Accepted Answer

It helps buffer blood pH by converting to bicarbonate and hydrogen ions

Question 19

Which structure is responsible for the majority of gas exchange in the lungs?

Accepted Answer

Alveoli

Question 20

A patient’s ECG shows a T-wave. What does this represent?

Accepted Answer

Ventricular repolarization

Cardiovascular and Respiratory Systems: Key Structures and Functions

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