Physiology Exercise Responses Quiz

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Questions and Answers

What does a rightward shift in the hemoglobin $O_2$ dissociation curve indicate?

Decreased carbon dioxide levels
Increased affinity of hemoglobin for $O_2$
Reduced affinity of hemoglobin for $O_2$ (correct)
Increased oxygen supply during rest

Which of the following factors contributes to the Bohr shift?

Stable oxygen levels
Decreased $CO_2$ partial pressure
Increased acidity (correct)
Lower temperature

What happens to heart rate during exercise?

It decreases gradually
It fluctuates unpredictably
It increases gradually and sharply (correct)
It remains stable

What occurs during the recovery phase after exercise?

<p>Heart rate returns to resting values gradually (A)</p> Signup and view all the answers

What is indicated by 'oxygen supply is clamped' during exercise?

<p>Oxygen availability is limited during high demand (D)</p> Signup and view all the answers

Flashcards

What is the Bohr shift?

The Bohr shift describes the relationship between hemoglobin's affinity for oxygen and factors like temperature, acidity, and carbon dioxide levels. It demonstrates how these factors can affect oxygen delivery to tissues.

What does a rightward shift in the Bohr curve signify?

A rightward shift in the Bohr curve indicates that hemoglobin has a lower affinity for oxygen. This means it releases oxygen more readily to tissues.

What factors cause a rightward shift in the Bohr curve?

Increased temperature, acidity, and carbon dioxide levels all contribute to a rightward shift in the Bohr curve. These conditions are often seen during exercise.

How does the Bohr shift contribute to the delivery of oxygen during exercise?

During exercise, the body increases its demand for oxygen. This demand is met by a combination of increased heart rate and a rightward shift in the Bohr curve, ensuring sufficient oxygen delivery to the working muscles.

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Why is the Bohr shift important?

The Bohr shift plays a crucial role in delivering oxygen to actively working tissues during exercise by facilitating the release of oxygen from hemoglobin.

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