How does exercise effect the heart rate?
Improves the muscles' ability to pull oxygen out of the blood, reducing the need for the heart to pump more blood to the muscles. Reduces stress hormones that can put an extra burden on the heart. Works like a beta blocker to slow the heart rate and lower blood pressure.
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Poliomyelitis is an RNA virus that can invade the nervous system and cause paralysis within a matter of hours. The nearly complete elimination of polio worldwide is due to
A. antibiotics. B. improved water quality. C. vaccination. D. quarantine. E. mosquito control.
When calcium levels rise, the __________ secrete(s)
__________, which __________ osteoclast activity. a. parathyroids; calcitonin; suppresses b. thyroid; calcitonin; suppresses c. thyroid; calcitonin; enhances d. thyroid; PTH; suppresses e. parathyroids; PTH; enhances
The product(s) of meiosis I in oogenesis is/are
A. a secondary oocyte. B. a primary oocyte. C. a secondary oocyte and a polar body. D. a primary oocyte and a polar body. E. a polar body.
A torn tendon sidelines athletes for long periods of time because the tissues possess less vascular tissue than bone
Indicate whether the statement is true or false