All leukocytes arise from:

A) lymphoid stem cells. B) leukoblasts.
C) myeloid stem cells. D) hematopoietic stem cells (HSCs).


Answer: D

Anatomy & Physiology

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One function of helper T-lymphocytes is to enhance the activity of cells of the innate immune system.

Answer the following statement true (T) or false (F)

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Which of the following is NOT normally a route of transmission of HIV/AIDS?

A. Via breast milk during lactation B. Across the placenta from an infected mother to her fetus during pregnancy or delivery C. Kissing or contact with items contaminated by the saliva of an infected individual D. Transfer of contaminated blood or blood products from one person to another E. Unprotected sexual intercourse with an infected partner

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