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Home Q & A Board Biology-Related Homework Help Anatomy and Physiology
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snowhite snowhite
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8 years ago
What prevents the backflow of blood in veins?
A) thick smooth muscle and elastic layers
B) valves
C) the narrowed lumen
D) increased blood pressure
Textbook 
Human Anatomy

Human Anatomy


Edition: 7th
Authors:
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WideEyesWideEyes
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8 years ago
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snowhite Author
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8 years ago
I really appreciate your help!
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8 years ago
Mark it solved when you get a chance Slight Smile
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