The cardiovascular system consists of the heart and the ________
A) lungs and heart
B) brain, blood vessels, and nervous system
C) vascular structures
D) skin
C
Explanation: A) The lungs are part of the respiratory system.
B) These are not part of the cardiovascular system.
C) Correct! The combining form vascul/o- means "blood vessel."
D) The skin is part of the integumentary system.
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Fill in the missing word in the definition for the key term.
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