The effect of acetylcholine on heart muscle cells is to
a. stimulate one contraction.
b. increase the rate of beating.
c. decrease the rate of beating.
d. relax the heart.
Ans: a. stimulate one contraction.
You might also like to view...
The eukaryotic organelle that is directly involved in the transport of proteins synthesized on the surface of the rough ER is called the:
A. mitochondrion. B. vacuole. C. smooth ER. D. Golgi body. E. nucleus.
Which one of the following is not important to the concept of homology?
A. Homologous features must be found in a common ancestor. B. It can include anatomical, physiological, or molecular features. C. Features must share a common developmental pattern. D. Species with homologous features must be related. E. None of the features being compared can be vestigial.
Four of the five answers are important evolutionary adaptations in primates. Select the exception
a. forward facing eyes b. upright walking c. grasping hands d. the development of a restricted or specialized diet e. brain expansion and elaboration
Mycorrhizae are nitrogen-fixing bacteria living within the roots of certain tropical trees
Indicate whether the statement is true or false