Phillip is breathing at approximately 40 ventilations per minute. What is the respiratory center indicating?
Select one:
a. low oxygen concentration in the lungs
b. high carbon dioxide concentration in the blood
c. low oxygen concentration in the blood
d. the firing of the intercostal nerves
e. stretch receptors in the alveolar walls
b. high carbon dioxide concentration in the blood
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Answer the question using the accompanying figure. During metamorphosis of a tadpole, 'A' is the ____
a. thyroid b. parathyroid c. hypothalamus
d. adrenal cortex e. posterior pituitary
The part of the antibody that binds an antigen:a
is known as the Fc fragment. b. is called an epitope. c. makes up the tail of the Y-shaped molecule. d. recognizes the antigenic determinant of that antigen. e. is known as the constant segment.
Jason and Ellen have had sexual problems recently. Based on past relationships, he expects that women want to have more aggressive, even "rough" sex. She, however, believes a man should be gentle, loving, and romantic during lovemaking. This is an example of _____.
Fill in the blank(s) with the appropriate word(s).
A tropical forest and desert are examples of
A. biospheres. B. biomes. C. populations. D. ecosystems. E. communities.