The Physiology of Exercise and Oxygenation Quiz

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What is the percentage of CO2 in the atmosphere during breath ventilation and incremental exercise?

5%
3% (correct)
10%
1%

What happens to ventilation during incremental exercise?

It fluctuates randomly
It decreases linearly
It remains constant
It has breakpoints where it increases faster (correct)

What does an increase in tidal volume cause in terms of VD/VT ratio?

No change in air distribution
More air going to alveoli (correct)
Less air going to alveoli
Decrease in alveolar ventilation

What happens to minute ventilation during incremental exercise?

It still increases (C) Signup and view all the answers

What is the definition of exercise-induced arterial hypoxemia (EIAH)?

Condition when O2 carried in arterial blood is severely reduced (C) Signup and view all the answers

What happens to oxygen levels in the muscle around 50% of maximum work rate?

O2 extraction from blood plateaus (C) Signup and view all the answers

What happens to venous blood saturation as workload increases?

It decreases and then plateaus around 80% (A) Signup and view all the answers

What happens to arterial CO2 levels at higher intensity exercise?

Arterial CO2 levels drop off (A) Signup and view all the answers

What is the atmospheric pressure at sea level?

760 mm Hg (C) Signup and view all the answers

What is the percentage of oxygen in the room based on the given information?

21% (A) Signup and view all the answers

What happens to alveolar and arterial PO2 at maximal exercise compared to rest?

They are higher than at rest (C) Signup and view all the answers

What happens to mean capillary and Mb (myoglobular) O2 mm Hg at rest compared to maximal exercise?

They are higher at rest than at maximal exercise (D) Signup and view all the answers

What is the percentage of oxygen saturation in the blood denoted by SaO2%?

Percentage of oxygen in hemoglobin (A) Signup and view all the answers

What is the effect of a decrease in pH on the oxyhemoglobin dissociation curve?

Shifts the curve to the right (B) Signup and view all the answers

What is the primary function of carbonic anhydrase in CO2 transport?

Catalyzes the conversion of CO2 to bicarbonate (D) Signup and view all the answers

What is the main source of H+ ions in the body?

Lactic acid (B) Signup and view all the answers

What does hyperpnea refer to?

Hyperventilation during heavy exercise (A) Signup and view all the answers

What happens to the a-vO2 difference in the blood during exercise?

Decreases (C) Signup and view all the answers

What is the primary function of the Haldane effect?

Promotes the release of CO2 from hemoglobin (D) Signup and view all the answers

What is the primary effect of an increase in temperature on the oxyhemoglobin dissociation curve?

Shifts the curve to the right (C) Signup and view all the answers

What is the primary function of the Bohr effect?

Decreases affinity of oxygen for hemoglobin due to CO2 and pH changes (D) Signup and view all the answers

What is the primary function of the bicarbonate buffering system in the body?

Regulating blood pH (D) Signup and view all the answers

What is the primary function of the oxyhaemoglobin dissociation curve?

Illustrates the relationship between oxygen saturation and partial pressure of oxygen (B) Signup and view all the answers

What is the primary function of the capillarization process in the context of training?

Increases the number of capillaries for improved gas exchange (C) Signup and view all the answers

CO2 % during breath ventilation and incremental exercise?

3%

Ventilation during incremental exercise?

Increases, with breakpoints where it increases faster.