Physiology of Oxygen and Heart Rate

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Questions and Answers

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

No change in hemoglobin's affinity for $O_2$
Increased affinity of hemoglobin for $O_2$
Decreased affinity of hemoglobin for $O_2$ (correct)
Hemoglobin binds oxygen more effectively

Which condition contributes to a right shift of the $O_2$ Hb dissociation curve?

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

During what phase is the heart rate (HR) expected to be approximately stable?

During intense physical activity
During recovery
During rest (correct)
During exercise

What happens to heart rate during recovery after exercise?

<p>It gradually decreases to normal (C)</p> Signup and view all the answers

What is indicated by 'plateau as clamped = supply' during exercise?

<p>Oxygen supply remains stable (A)</p> Signup and view all the answers

Flashcards

Bohr Shift

A shift to the right on the oxygen-hemoglobin dissociation curve, indicating reduced affinity of hemoglobin for oxygen. This happens due to increased temperature, acidity, or carbon dioxide partial pressure.

Heart Rate (HR)

The rate at which your heart beats, usually measured in beats per minute (bpm).

Oxygen Supply Clamped

During exercise, oxygen demand increases, and the body's ability to deliver oxygen is limited. This leads to a plateau or leveling off in oxygen supply, despite continued increased demand.