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1
Which one of the following statements about gastrovascular cavities is incorrect?
A)In animals with gastrovascular cavities, the surrounding water functions as the circulatory system.
B)Digested food can reach all the body's cells because water circulates throughout the entire cavity.
C)Gastrovascular cavities are common in most forms of marine animals.
D)The gastrovascular cavity has a single opening to the outside.
E)All of the statements about gastrovascular cavities are correct.
2
Which one of the following components is required in order to be referred to as a true circulatory system?
A)Blood or hemolymph
B)Blood vessels
C)One or more hearts
D)Blood or hemolymph and one or more hearts
E)Blood or hemolymph, blood vessels, and one or more hearts
3
Which one of the following animals has an open circulatory system?
A)Vertebrates
B)Cephalopods
C)Earthworms
D)Molluscs
E)All of these animals have closed circulatory systems.
4
Which of the following statements about blood pressure is incorrect?
A)Blood flow is inversely proportional to pressure and directly proportional to resistance.
B)Blood pressure is not the same in all areas of an animal's body.
C)The primary contribution to overall resistance to blood flow is arteriole radius.
D)A high hematocrit reduces overall blood flow.
E)All of the statements about blood pressure are correct.
5
Which of the following has a direct effect on cardiac output?
A)heart size
B)stroke volume
C)heart rate
D)Heart size and heart rate
E)Heart size, stroke volume, and heart rate
6
True or False: Cardiovascular disease accounts for more deaths each year in the U.S. than any other cause.
A)True
B)False





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