AP BIOLOGY

Detailed explanation-1: -HIV finds the white blood cells, called CD4 cells. HIV gets inside the CD4 cell and makes copies of itself. Then, HIV kills the CD4 cell and the new HIV copies find other CD4 cells to get inside and start the cycle again. HIV kills immune system cells that help the body fight infections and diseases.

Detailed explanation-2: -HIV destroys CD4 cells (also called T cells or helper cells), which are critical to the immune system. CD4 cells are responsible for keeping people healthy and protecting them from common diseases and infections. As HIV gradually weakens the body’s natural defenses, signs and symptoms will occur.

Detailed explanation-3: -HIV (human immunodeficiency virus) is a virus that attacks the body’s immune system. If HIV is not treated, it can lead to AIDS (acquired immunodeficiency syndrome). There is currently no effective cure. Once people get HIV, they have it for life.

Detailed explanation-4: -Infection with HIV is particularly troublesome for the immune system because it infects and destroys immune system cells called T helper lymphocytes or CD4+ T cells. Untreated, the disease progresses over a few years to AIDS, leading to eventual death for most people.

Detailed explanation-5: -HIV attacks a specific type of immune system cell in the body. It’s known as the CD4 helper cell or T cell. When HIV destroys this cell, it becomes harder for the body to fight off other infections. When HIV is left untreated, even a minor infection such as a cold can be much more severe.