★ Circulatory System Quiz
The upper part of the heart is made up of two chambers called what?
A. Ventricles
B. Atria
Select your answer:

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Regulation of Heart Rate › ViewWhich part of the brain controls the autonomic activity of the heart?
A. Cerebral cortex
B. Medulla
C. Pituitary gland
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Short term effects of exercise begin to occur
A. Immediately
B. Half an hour after exercise
C. An hour after exercise
D. 24 hours after exercise