The neural control centers for the heart ____
a. are primarily stimulatory
b. are found in the spinal cord and brain
c. influence only heart rate
d. stimulate heart rate and decrease contraction strength
e. play a minor role in cardiovascular feedback
ANSWER: b
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The most prevalent human infectious diseases are caused by
A) bacteria. B) viruses. C) fungi. D) protozoans.
Those organisms that live only part of their life history as plankton are called:
a. meroplankton. b. holoplankton. c. nanoplakton. d. seston. e. pleuston.
According E. O. Wilson, in order for every person on the planet to be able to reach the same level of consumption as in the United States, ________additional planet earths would be required.
Fill in the blank(s) with correct word
Which of the following is a potential response by a plant host to a parasite?
A) formation of a gall B) allelopathy C) increased production of lymphocytes D) more rapid growth of tissues