The blood-testis barrier
A. feeds sustentacular cells.
B. keeps blood from engorging the testis.
C. is formed by the primary spermatocytes.
D. isolates sperm cells from the immune system.
E. nourishes the developing spermatozoa.
D
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Which movement cannot be made by the radiocarpal joint?
A. Inversion B. Extension C. Adduction D. Flexion E. Abduction
When ice skating at Rockefeller Center, a young skater got thoroughly chilled. Which of his body's reaction to the cold gave him "goose pimples?"
A) Contraction of erector muscles in his skin B) His skin hairs pulling his skin muscles together C) Dehydration of his skin surface by cold D) Faster subcutaneous blood flow
A pivot joint
A. is a biaxial joint. B. is between the atlas and the occipital bone. C. is a modified ball and socket joint. D. restricts movement to rotation. E. allows gliding movement.
Which of the following definitions best describes the timbre of sounds?
A. Resonance quality B. Pitch C. Amplitude D. Loudness E. Wave frequency