The respiratory defense system is important for all of the following reasons except
A) helping filter the air.
B) helping warm the air.
C) keeping out debris.
D) keeping out pathogens.
E) providing gas exchange.
Answer: E
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Which of the following is never catabolized for energy, even in cells dying of starvation?
A) DNA B) proteins C) rRNA D) tRNA E) mRNA
Which of the following will increase the heart rate?
A. A decrease in the level of carbon dioxide in the blood B. An increase in the level of carbon dioxide in the blood C. A rise in pH D. An increase in blood pressure E. An increase in the level of blood oxygen
The sympathetic preganglionic neuron cell bodies are housed in the ________ horn of the appropriate thoracolumbar regions of the spinal cord.
Fill in the blank(s) with the appropriate word(s).
Morphogenesis refers to
A. shaping of the embryo and migration of cells. B. increase of size. C. cells having a specific function. D. All apply.