Sperm are moved along the ductus deferens (vas deferens) by
A) hydrostatic force.
B) ciliary action.
C) peristaltic contractions.
D) suction.
E) hydraulic action.
C
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Skin can regenerate effectively even after considerable damage has occurred because
A) the epidermis of the skin has a rich supply of small blood vessels. B) stem cells persist in the skin even after injury. C) fibroblasts in the dermis can give rise to new germinal cells in the epidermis. D) contraction in the area of the injury brings cells of adjacent strata together. E) cells of the stratum basale cannot migrate to other positions in the skin.
With a family history of cardiovascular disease, which toast spread would be considered the most "heart healthy?"
A) olive oil B) butter containing butterfat C) lard (pig fat) D) margarine containing trans fats
Which of the following is NOT a function of the plasma membrane proteins?
A) stabilizing temperature B) acting as carriers C) acting as enzymes D) acting as channels
The prominent ridges in the lining of the empty stomach are called
A) cardia. B) papillae. C) rugae. D) plicae. E) villi.