Acetylcholine induces vasodilation in intact blood vessels because _____ is released from the _____.
A. nitric oxide, endothelium
B. nitric oxide, smooth muscle layer
C. nitric oxide, lymphatic system
D. carbon monoxide, endothelium
E. norepinephrine, endothelium
A. nitric oxide, endothelium
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Angiosperms that originated as hybrids resulting from a cross between two closely related species are known as ____
a. paleopolyploids b. autopolyploids c. allopolyploids d. hexapolyploids e. tetrapolyploids
All of the following are true of every cell of the early
human embryo EXCEPT that a. each has the same genes as all the others. b. each can give rise to an entire human. c. they are undifferentiated. d. all will differentiate alike. e. all have maternal messages.
1st law of thermodynamics
What will be an ideal response?
Net carbon uptake per unit time by a plant is directly related to
A) the difference between photosynthetic rate and respiration rate. B) photosynthetic rate. C) respiration rate. D) the difference between photosynthetic rate and decomposition rate.