Melanin is produced only by
A. keratinocytes.
B. Langerhans cells.
C. melanocytes.
D. basal cells.
E. Merkel's cells.
C
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Although the integument is a covering, it is by no means simple, and some of its functions include ________.
A) the dermis providing the major mechanical barrier to chemicals, water, and other external substances B) resident macrophage-like cells whose function is to ingest antigenic invaders and present them to the immune system C) cooling the body by increasing the action of sebaceous glands during high-temperature conditions D) epidermal blood vessels serving as a blood reservoir
Abby is trying to focus on her A&P exam, but she feels something crawling along the back of her arm. Alarmed, she jumps up and brushes away a small spider. Which of the following does Abby have to thank for alerting her to this issue?
A. Fasciculus gracilis tract B. Spinocerebellar pathway C. Tectospinal tract D. Spinothalamic tract
White blood cells engulf bacteria by means of __________.
A. phagocytosis B. pinocytosis C. active transport D. facilitated diffusion E. exocytosis
Type AB blood
A. has no antigens on the red cells. B. has O antigens on the red cells. C. has both A and B antigens on the red cells. D. has both A and B antibodies on the red cells. E. has both A and B antibodies in the plasma.