The nervous system controls the contraction of in the wall of the bronchioles, thereby adjusting airflow in response to metabolic demands.
A. autonomic; skeletal muscle
B. autonomic; smooth muscle
C. somatic; skeletal muscle
D. somatic; smooth muscle
E. autonomic; cartilage
B. autonomic; smooth muscle
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CD4 and CD8 proteins are used for in vitro tests as T cell markers to differentiate TH cells from TC cells
Indicate whether the statement is true or false.
The generally accepted explanation for the
movement of organic compounds in phloem is a. the cohesion-tension theory. b. the pressure flow theory. c. active transport. d. the transpiration-pull theory. e. root pressure.
Generation of an action potential by a neuron may ultimately stimulate
A) another nerve cell. B) skeletal muscle cells. C) gland cells. D) smooth muscle cells. E) All of the above may be stimulated by a signal.
Which organism is most likely to have a type III survivorship curve?
A. A domestic dog B. Paramecium C. Corn in a farmer's field D. An oak tree