Question 1

Which region of the brain is primarily responsible for generating the rhythmic pattern of breathing?

Accepted Answer

Pre-Bötzinger complex in the medulla oblongata

Question 2

During high altitude ascent, which physiological change occurs within the first 24 hours?

Accepted Answer

Increased ventilation rate

Question 3

What is the primary chemical reaction catalyzed by carbonic anhydrase in red blood cells?

Accepted Answer

$$CO_2 + H_2O$$ \rightarrow $$HCO_3^- + H$$^+$$

Question 4

A climber at high altitude experiences respiratory alkalosis. What is the underlying cause?

Accepted Answer

Decreased blood $$CO_2$$ due to increased ventilation

Question 5

Which feedback mechanism is most important for regulating ventilation in response to elevated blood $$CO_2$$?

Accepted Answer

Medullary chemoreceptors

Question 6

What effect does increased 2,3-diphosphoglyceric acid (2,3-DPG) have on hemoglobin's oxygen affinity?

Accepted Answer

Decreases oxygen affinity

Question 7

Which equation best describes the relationship between carbon dioxide and blood pH?

Accepted Answer

$$CO_2 + H_2O$$ \leftrightarrow H_2CO_3 \leftrightarrow $$HCO_3^- + H$$^+$$

Question 8

A patient with chronic obstructive pulmonary disease (COPD) has elevated blood $$CO_2. $$What is the expected effect on blood pH?

Accepted Answer

Blood pH will decrease (acidosis)

Question 9

Which of the following is a long-term adaptation to high altitude that increases oxygen carrying capacity?

Accepted Answer

Increased erythropoietin (EPO) production

Question 10

How does the Bohr effect facilitate oxygen delivery to tissues during exercise?

Accepted Answer

Increased $$CO_2$$ and decreased pH reduce hemoglobin's affinity for $$O_2$$

Question 11

Which of the following best explains why climbers experience hypoxia at high altitude?

Accepted Answer

Lower atmospheric pressure reduces $$P_{O_2$}$$

Question 12

What is the effect of increased temperature on hemoglobin's oxygen affinity?

Accepted Answer

Increased temperature decreases oxygen affinity

Question 13

Which of the following is NOT a method to increase the oxygen carrying capacity of blood?

Accepted Answer

Decreasing hematocrit

Question 14

A climber at high altitude has a hematocrit of 52%. What does this indicate?

Accepted Answer

A higher percentage of red blood cells in total blood volume

Question 15

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

Accepted Answer

Increased blood $$CO_2$$

Question 16

What is the role of chemoreceptors in the regulation of ventilation?

Accepted Answer

They detect changes in blood $$CO_2$$, $$O_2$$, and pH

Question 17

Which of the following best describes the immediate ventilatory response to high altitude?

Accepted Answer

Acute increase in ventilation rate

Question 18

Which of the following is a consequence of respiratory alkalosis?

Accepted Answer

Increased blood pH

Question 19

Which molecule acts as an important buffer for blood pH in body tissues?

Accepted Answer

Bicarbonate ($$HCO_3$$^-$$)

Question 20

Which of the following is a direct effect of hypoxia on the body?

Accepted Answer

Low arterial $$P_{O_2$}$$ and low $$O_2$$ carrying capacity

Neural Control of Ventilation, Blood Gases, and High Altitude Physiology

Guida di studio - Domande di pratica