Question 1

Which of the following best describes the Bohr Effect in relation to hemoglobin and oxygen transport?

Accepted Answer

Low pH decreases hemoglobin's affinity for O2, promoting O2 unloading.

Question 2

What percentage of oxygen is transported dissolved in plasma, and what is its physiological significance?

Accepted Answer

About 1.5%; it is the only form of O2 that exerts partial pressure.

Question 3

Which equation represents the conversion of carbon dioxide to bicarbonate in red blood cells?

Accepted Answer

$$\mathrm{CO_2$ + H_2O \rightarrow H_2CO_3 \rightarrow $$HCO_3$$^- + H^+}$$

Question 4

During exercise, which factors favor hemoglobin-O2 dissociation in active tissues?

Accepted Answer

High temperature, low pO2, high pCO2, low blood pH, high BPG

Question 5

Which of the following statements about the Haldane Effect is correct?

Accepted Answer

At the lungs, high pO2 decreases hemoglobin's ability to carry CO2.

Question 6

A patient with chronic obstructive pulmonary disease (COPD) is likely to experience which of the following changes in their alveoli?

Accepted Answer

Permanent enlargement and destruction of alveolar walls

Question 7

Which neural structure is primarily responsible for setting the basic ventilation rate?

Accepted Answer

Ventral respiratory group (VRG)

Question 8

If arterial pH decreases due to increased lactic acid, what is the expected response in ventilation rate?

Accepted Answer

Ventilation rate increases to remove CO2 and restore pH.

Question 9

Which of the following best explains why fetal hemoglobin has a higher affinity for O2 than adult hemoglobin?

Accepted Answer

Fetal hemoglobin binds O2 more tightly to ensure O2 uptake from maternal blood.

Question 10

Which of the following is NOT a characteristic of asthma?

Accepted Answer

Permanent destruction of alveolar walls

Question 11

Which equation describes the formation of carbaminohemoglobin?

Accepted Answer

$$\mathrm{Hb + CO_2$ \rightarrow $$HbCO_2$$}$$

Question 12

Which of the following is a direct effect of increased pCO2 on peripheral chemoreceptors?

Accepted Answer

Stimulation of hyperventilation

Question 13

A patient with cystic fibrosis is likely to experience which of the following symptoms due to defective Cl- transporter?

Accepted Answer

Mucus accumulation, chronic cough, and persistent lung infections

Question 14

Which of the following best describes the role of the dorsal respiratory group (DRG)?

Accepted Answer

Integrates impulses from peripheral stretch receptors and chemoreceptors and relays them to the VRG

Question 15

Which of the following is true regarding the sensitivity of ventilation rate to pO2 and pCO2?

Accepted Answer

Ventilation rate is more sensitive to changes in pCO2 than pO2.

Question 16

Which of the following is a characteristic symptom of tuberculosis reactivation?

Accepted Answer

Granulomas and lung cavitation

Question 17

If a patient is exposed to high altitude, which change is most likely to occur in the hemoglobin dissociation curve?

Accepted Answer

The curve shifts to the right, decreasing O2 affinity.

Question 18

Which of the following is a consequence of decreased arterial pH detected by central chemoreceptors?

Accepted Answer

Increased ventilation rate (hyperventilation)

Question 19

Which of the following best describes the effect of BPG (2,3-bisphosphoglycerate) on hemoglobin?

Accepted Answer

High BPG decreases hemoglobin's affinity for O2, promoting O2 unloading.

Blood Gas Transport and Neural Control of Ventilation: Study Notes

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