In humans, the only cell that bears a flagellum is the ________ cell.
A. kidney
B. sperm
C. red blood
D. oocyte
E. brain
Answer: B
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A plane running vertically or longitudinally from front to back parallel to the midsagittal or median plane, dividing the body into right and left parts, is ___________________.
Fill in the blank(s) with the appropriate word(s).
In which of the following forms does Ca2+ exhibit profound effects on such things as neuromuscular excitability?
a. free, unbound diffusible Ca2+ b. intracellular Ca2+ c. calcium phosphate crystals impregnated in the organic matrix of bone d. calcium bound to plasma proteins e. insoluble Ca2+ salts
What occurred when pepsin was boiled?
A) The enzyme didn't work because the incubation temperature was too high. B) It was inactivated. C) Its activity increased. D) The enzyme didn't work because the pH was too low.
Which of the following might trigger erythropoiesis?
A) an increased number of RBCs B) blood oxygen levels fall below normal C) moving to a lower altitude D) decreased tissue demand for oxygen