A child who pitches in Little League baseball competition may risk arm injuries that would not occur in an adult. Why?
What will be an ideal response?
A child has a separate epiphysis at the proximal end of the ulna, and the stress of throwing a baseball can cause separation of this element at the metaphysis. Once the ulna has reached full length in an adult, the epiphysis has fused to the diaphysis and cannot be as easily pulled apart.
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A. heart B. spleen C. skeletal muscles D. pancreas
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A. increased reabsorption of water. B. increased reabsorption of Na+. C. decreased urine output. D. increased secretion of Na+. E. increased urine output.
The binding of FAS and its FAS ligand will trigger ________.
A. T lymphocyte apoptosis B. T lymphocyte activation C. antibody production D. interferon release