6Aproximaely what percent of people in the US have a pagemaker in their heart? a

Question

6Aproximaely what percent of people in the US have a pagemaker in their heart? a. 25% b. 50% 5% 100% 67. Water makes up approximately what percent of your blood a. 55% b. 49.5% 99.5% 68. Thermoregulation is controlled by a region of the brain called the thalamus c. cerebral cortex d. medulla oblongata b. pituitary 69. An example of positive feedback in the human body is a. shivering b. blood pH control child birth d. increase fur in the winter 70. The human body temperature can vary how much normally in a single day? 0° F 1° F c. 5° F d. 10° F

Explanation / Answer

ANSWER 66.
Assuming that it is a trick question cause the pacemaker IN THE heart must be the natural pacemaker called sinoatrial node (SA node) which generates the heart-beat, so the answer would be:
d. 100%

ANSWER 67.
55% of the blood is plasma, out of which 90% of plasma is water. So 50% * 90%, gives an answer of:
b. 49.5%

ANSWER 68.
a. Hypothalamus

ANSWER 69.
c. Child birth - releases ocytocin which increases contraction rate

ANSWER 70.
b. 1 degree F - because 0 is not possible, and 5 is way too high

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