Aging of the immune system makes older people more susceptible to cancer and infectious disease because of a decline in ________.
A. prothrombin and fibrinogen
B. antigen-presenting cells and helper T cells
C. red blood cells and platelets
D. alpha and beta globulins
E. complement proteins
Answer: B
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Answer the following statement true (T) or false (F)
Afferent fibers from muscle spindle stretch receptors in a muscle make excitatory synaptic contact with motor neurons that innervate the extrafusal fibers of the same muscle.
Answer the following statement true (T) or false (F)
ATP neurotransmitters have what basic effect on the body?
What will be an ideal response?
The aggregation of crystallin proteins in the lens produces ________.
A. myopia B. cataracts C. glaucoma D. astigmatism