What are cd4+ cells?
a. hiv treatment cells
b. t cell that are destroyed by hiv.
c. an experimental aids vaccine
d. opportunistic cells that destroy the immune system

cd4+ are t cells

Explanation:

hiv is the virus that weakens it and its important for cd4 to work because cd4 signals other cells via cell signalling (b lymphocytes) to attack hiv viruses.

between the two muscle layers is the myenteric or auerbach's plexus, which controls peristalsis. in the colon, the muscularis externa is much thicker because the feces are large and heavy, requiring more force to push along. the stomach has a third layer of muscularis externa: the inner oblique layer.

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explanation: