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Home Q & A Board Biology-Related Homework Help General Biology
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qpitt19777 qpitt19777
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6 years ago
What structure will help prevent the backflow of blood within the veins?
 
  a. Valves
 b. Skeletal muscle
 c. Endothelium
 d. Smooth muscle
 e. Basement membrane

Question 2

HIV can be transmitted through ________.
 
  a. unprotected sex with an infected partner only
 b. infected mothers breast-feeding children only
 c. all of the choices
 d. the linings of the penis, vagina, mouth, and rectum only
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joehendyjoehendy
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6 years ago
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qpitt19777 Author
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6 years ago
Helped a lot
byehoe
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Yesterday
this is exactly what I needed
Tim0301
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2 hours ago
Thanks for your help!!
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