In the human digestive system, ________ is the rhythmic smooth muscle contractions that aid in moving food along the system.
A. countercurrent exchange
B. phagocytosis
C. peristalsis
D. rumination
E. sphincter contractions
C. peristalsis
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Neurons of the somatic nervous system relay:
a. commands to skeletal muscles b. information from the internal environment to the central nervous system c. signals to smooth and cardiac muscles d. signals to adjust digestion e. signals to adjust the breathing rate
The respiration rate of homeotherms is proportional to
A) air pressure. B) body temperature. C) body size. D) environmental temperature.
Some scientists propose that the kingdom Protista should be broken up into several kingdoms. Which of these statements accurately supports this idea?
a. Protists are all very similar and easy to confuse b. Protista contains very diverse organisms that do not fit into the other kingdoms c. Protists are the most numerous organism on Earth d. Protista evolved before any other kingdoms
The fermentation by-products of Clostridium perfringens can destroy muscle structure in myonecrosis.
a. true b. false