6. how do blood vessels maintain blood flow in the body?
a. contract and reduce space
b. use oxygen to increase pressure in vessels
c. relax and allow more blood to flow
d. depend upon body movement to move blood

7. what role do the kidneys play in blood flow?
a. regulate water volume in blood and urine
b. send water to urine during low blood pressure
c. release hormones as part of the endocrine system
d. produce more red blood cells to increase blood flow

8. which one of these health benefits of exercise is not directly related to cardiovascular health?
a. reduced fat levels
b. strengthened cardiac muscle
c. lower cholesterol
d. stronger striated muscle

9. which of the following is least likely to artificially raise a person's blood pressure reading?
a. fear of the doctor's office
b. an arm cuff that is too big
c. exercising immediately before measuring
d. drinking liquids immediately before measuring