Vitamin D3 formed within the skin has all of these effects on other organ systems except that it
A) is essential for absorption of calcium and phosphorus by the digestive system.
B) functions as a precursor for the hormone calcitriol in the endocrine system.
C) is essential for bone maintenance.
D) functions in the activation of plasma cells by the lymphatic system.
E) is essential for bone growth.
Answer: D
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A) interphalangeal joints B) amphiarthrotic joints designed for strength C) cartilaginous joints where cartilage is found between the bones D) joints that permit angular movements
Voluntary motor impulses leave the spinal cord via the ________ of gray matter.
A. posterior funiculus B. anterior funiculus C. lateral horn D. posterior horn E. anterior horn
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