★ Circulation and Excretion Quiz
Most of the carbon dioxide produced by humans
A. converted to bicarbonate ions by and enzyme on the RBC
B. bound to hemoglobin
C. simply dissolved in the plasma
Select your answer:
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Cardiovascular System › ViewWhat is the side of the adult heart?
A. size of an apple
B. size of a pillow
C. size of a pea
D. size of a large fist
Aerobic- Cardio Respiratory Endurance › View
If you are walking at a pace that causes your heart to beat less than 50% of its maximum heart rate, which FITT principle variable do you need to change to improve your cardiorespiratory endurance?
A. Frequency
B. Intensity
C. Time
D. Type