Smooth muscle in the arteriole walls can vasoconstrict or vasodilate, which:a
helps to regulate blood pressure.
b. helps to accelerate the flow of blood through the vessels.
c. prevents the back flow of blood into the tissues.
d. squeezes oxygen out of the blood.
e. adds strength to the blood vessels.
a
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Based on the phylogenetic tree below, which of the following statements is FALSE?
A) Species E is more closely related to species A than to species D. B) Species D is more closely related to species C than to species E. C) Species F is more closely related to species D than to species E. D) Species C is more closely related to species B than to species D.
In some cases, just a few hormone molecules binding to the surface of a cell can trigger a very large response because ____.
A. the signal is amplified by activation of transcription factors that each catalyze multiple reactions B. each hormone can bind to multiple receptors simultaneously causing amplification of the signal C. the signal is amplified by activation of enzymes that each catalyze multiple reactions D. each hormone can bind to transcription factors simultaneously causing amplification of the signal E. the hormone triggers the cell to release more hormones, amplifying the signal
The basal metabolic rate per unit of body mass is highest in a
A) large endotherm. B) small endotherm. C) large ectotherm. D) small ectotherm.
What system is used for excision repair in E. coli, what are its components, and what do they specifically do in the process?
What will be an ideal response?