Exercise Physiology Quiz

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Questions and Answers

What happens to the oxygen-hemoglobin dissociation curve during exercise?

It shifts downward due to increased oxygen levels.
It shifts to the right because of increased CO2 pressure. (correct)
It remains unchanged regardless of CO2 levels.
It shifts to the left due to decreased acidity.

What heart rate (HR) is observed at rest according to the provided data?

Approximately 60 bpm.
Approximately 72 bpm. (correct)
Approximately 80 bpm.
Approximately 90 bpm.

During the recovery phase, what happens to the heart rate?

It immediately returns to exercise levels.
It gradually decreases to near-rest levels. (correct)
It fluctuates rapidly between high and low.
It remains elevated throughout the recovery.

What is indicated by the relatively flat line in the heart rate graph during exercise?

<p>Heart rate shows minimal increase before decreasing. (C)</p> Signup and view all the answers

What effect does increased acidity have on the Bohr effect?

<p>It promotes the release of oxygen from hemoglobin. (A)</p> Signup and view all the answers

Flashcards

Bohr Effect

The Bohr effect describes how the oxygen-hemoglobin dissociation curve shifts to the right in the presence of increased carbon dioxide (CO2) and acidity. This shift makes it easier for hemoglobin to release oxygen to the tissues.

Oxygen-Hemoglobin Dissociation Curve

The oxygen-hemoglobin dissociation curve (O2-Hb curve) shows the relationship between the partial pressure of oxygen (PO2) in the blood and the percentage of hemoglobin saturated with oxygen.

Bohr Effect During Exercise

During exercise, the body produces more carbon dioxide (CO2) and becomes more acidic. This leads to a rightward shift in the O2-Hb curve, making it easier for hemoglobin to release oxygen to the working muscles.

Bohr Effect During Recovery

During recovery, the body gets rid of CO2 and becomes less acidic. This causes a leftward shift in the O2-Hb curve, making it harder for hemoglobin to release oxygen.

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