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lisa_lordes lisa_lordes
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7 years ago
Which of the following is (are) found in many veins that help direct blood flow in one direction only: toward the heart?
A) lymph nodes
B) myocardium
C) valves
D) pericardium
Textbook 
Biology of Humans: Concepts, Applications, and Issues

Biology of Humans: Concepts, Applications, and Issues


Edition: 5th
Authors:
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PoalaPoala
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7 years ago
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lisa_lordes Author
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7 years ago
Thanks for your help!!
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Yesterday
Brilliant
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2 hours ago
Thanks
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