Which statement concerning gamete production is correct?
A) Progestins stimulate development of new follicles.
B) Sperm cells can be produced only at certain points in the reproductive cycle.
C) The number of sperm a man can produce is essentially unlimited, whereas the number of eggs a woman can potentially produce is limited.
D) A man is born with all of the sperm he will need for the rest of his life.
Answer: C
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Answer the following statements true (T) or false (F)
1. The nervous system of a cnidarian consists of a central ganglion leading into a nerve net. 2. The two body forms of some Radiata is an example of alternation of generations. 3. A medusa and polyp have similar body plans. 4. All Platyhelminthes are parasitic. 5. The disease schistosomiasis is caused by a parasitic trematode.
Which hormone is involved in maintaining the gamete or egg cell in females?
A. estradiol B. progesterone C. gonadotropin-releasing hormone D. follicle-stimulating and luteinizing hormones E. All of the choices are correct.
As elevation increases
a. O2 availability increases. b. O2 availability decreases. c. O2 availability remains constant. d. O2 levels increase, but there is none present above 20,000 feet. e. O2 levels decrease, but there is none present above 20,000 feet.
One division of the autonomic nervous system, called the ________ nervous system, is active in times of stress.
Fill in the blank(s) with the appropriate word(s).