Which of the following is not secreted by helper T cells?
a. B-cell growth factor
b. T-cell growth factor
c. interleukin 1
d. interleukin 2
e. macrophage migration inhibition factor
C
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The spinothalamic tract is
A) motor. B) transverse. C) efferent. D) ascending. E) descending.
Which of the following statements about mice and rats is true?
A) Mice are primarily nocturnal. B) Rats have poor swimming skills. C) Mice have superior detailed vision. D) Rats have 24 teeth.
When exposed to ultraviolet light, keratinocytes convert a steroid precursor into ________, a molecule that is crucial for regulation of calcium levels.
A. phosphorus B. calcitonin C. creatine D. calcitriol E. cholecalciferol
The spleen and thymus are part of the
A. cardiovascular system. B. respiratory system. C. lymphatic and immune systems. D. digestive system.