All leukocytes arise from:
A) lymphoid stem cells. B) leukoblasts.
C) myeloid stem cells. D) hematopoietic stem cells (HSCs).
Answer: D
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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
Which of the following produces tears?
A. The tarsal glands B. The lacrimal glands C. The puncta lacrimalia D. The lateral canthi E. The lacrimal sac
Deep pressure and vibration are detected by which of the following?
A. Tactile corpuscles B. Krause end bulbs C. Free nerve endings D. Lamellar corpuscles E. Ruffini corpuscles
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)