Question 1

Which of the following best describes the difference between pulmonary ventilation and respiration?

Accepted Answer

Pulmonary ventilation is the movement of air in and out of the lungs, while respiration is the exchange of gases.

Question 2

A patient is exposed to cold, dry air. Which structure in the nasal cavity helps to warm and humidify the incoming air, and what is the physiological consequence?

Accepted Answer

Nasal conchae; they increase water vapor production, reducing dehydration of respiratory surfaces.

Question 3

During gas exchange in the alveoli, which direction do oxygen and carbon dioxide move?

Accepted Answer

Oxygen moves from the alveoli to the blood; carbon dioxide moves from the blood to the alveoli.

Question 4

If the partial pressure of oxygen ($$pO_2) in $$the alveoli decreases, what is the most likely effect on oxygen diffusion into the blood?

Accepted Answer

Less oxygen will enter the blood because the gradient for diffusion is reduced.

Question 5

Which of the following equations correctly represents vital capacity ($$VC) in $$the lungs?

Accepted Answer

$$VC = IRV + TV + ERV$$

Question 6

A person is hyperventilating. What changes would you expect in their blood pH and carbon dioxide levels?

Accepted Answer

Blood pH increases and carbon dioxide levels decrease.

Question 7

Which of the following is NOT a way that carbon dioxide is transported in the blood?

Accepted Answer

Dissolved as oxygen gas

Question 8

What is the primary function of surfactant produced by type II alveolar cells?

Accepted Answer

To reduce surface tension and prevent alveolar collapse

Question 9

Which of the following would most likely stimulate an increase in ventilation rate?

Accepted Answer

An increase in $$pCO_2$$ detected by central chemoreceptors

Question 10

Which of the following conditions would promote the release of oxygen from hemoglobin in tissues?

Accepted Answer

Low pH and high $$pCO_2$$

Question 11

A patient is experiencing hypoventilation. Which of the following is a likely consequence?

Accepted Answer

Decreased blood pH due to accumulation of $$CO_2$$

Question 12

Which lung volume is defined as the amount of air remaining in the lungs after a normal exhalation?

Accepted Answer

Functional residual capacity ($$FRC)$$

Question 13

Which of the following best explains why oxygen moves from the alveoli into the blood?

Accepted Answer

Oxygen moves from areas of high partial pressure to low partial pressure.

Question 14

Which equation correctly represents total lung capacity ($$TLC$$)?

Accepted Answer

$$TLC = IRV + TV + ERV + RV$$

Question 15

A person takes a deep breath, stimulating the secretion of surfactant. What is the physiological benefit of this response?

Accepted Answer

It makes it easier for the lungs to expand and contract by reducing surface tension.

Question 16

Which of the following is a function of the larynx?

Accepted Answer

Opens and closes the airway with help from the epiglottis

Question 17

Which of the following would most likely occur if perfusion increases but ventilation does not?

Accepted Answer

Blood flow increases but less oxygen is available for exchange, leading to decreased oxygenation.

Question 18

Which chemoreceptors are primarily responsible for detecting changes in $$CO_2$$ and pH in the blood?

Accepted Answer

Central chemoreceptors in the brainstem

Question 19

Which of the following statements about oxygen transport in the blood is correct?

Accepted Answer

98.5% of oxygen is bound to hemoglobin, while 1.5% is dissolved in plasma.

Question 20

During expiration, which pressure relationship must be true for air to flow out of the lungs?

Accepted Answer

Intrapulmonary pressure is higher than atmospheric pressure.

Pulmonary Ventilation and Gas Exchange: Anatomy & Physiology Study Notes

Guida di studio - Domande di pratica

Study guide - Flashcard