Which is TRUE about sperm delivery?
A. Most of the ejaculated sperm arrive in the vicinity of the ovum (if there is one).
B. Sperm transport through the cervix is made possible by actions of progesterone on the cervical mucus.
C. Of the several hundred million sperm in an ejaculation, only about 100 to 200 reach the fallopian tube.
D. Sperm are able to fertilize an egg from the instant they arrive in the female reproductive tract.
E. Sperm can survive for up to 2 weeks in the mucus of the cervix.
C
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Having a greater amount of adipose tissue after menopause may reduce the risk of osteoporosis in females.
Answer the following statement true (T) or false (F)
Blood within the pulmonary veins returns to the ________.
Fill in the blank(s) with the appropriate word(s).
An enzyme is substrate-specific because of the shape of its ________.
A. alpha chain B. receptor C. terminal amino acid D. secondary structure E. active site
The statement "It initiates contraction of urinary bladder smooth muscle" is
A) true only for the parasympathetic nervous system. B) true only for the sympathetic nervous system. C) true for both the parasympathetic and sympathetic nervous systems. D) not true for either the parasympathetic or sympathetic nervous systems. E) true only for the somatic nervous system.