Which type of skeletal muscle fiber typically has the fewest mitochondria?
A. Type I
B. Type II
B
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Of the millions of sperm deposited into the vagina during intercourse, only a few hundred reach the secondary oocyte. What happens to the rest?
A. Some never become motile. B. They may become disoriented and lose direction. C. They may be destroyed by the acidic environment of the female tract. D. Many leak out of the vagina. E. All of the choices are correct.
The onset of puberty is triggered by an increase in
A. sensitivity of the hypothalamus to negative feedback by sex steroids. B. sensitivity of the pituitary to negative feedback by sex steroids. C. sensitivity of the gonads to pituitary gonadotropins. D. GnRH secretion. E. sensitivity of the pituitary to GnRH.
Lymphatic trunks from the lumbar region empty into the ________.
A. left lymphatic duct B. right lymphatic duct C. sacral duct D. thoracic duct
The process that transports solutes, including many drugs, into the tubular fluid is called
A) filtration. B) reabsorption. C) absorption. D) excretion. E) secretion.