During the peak of the action potential which ion has the greatest permeability?
a. sodium.
b. potassium.
c. calcium.
d. chloride.
e. protein.
B
You might also like to view...
The _________ of a muscle refers to the identity of the nerve that stimulates it.
Fill in the blank(s) with the appropriate word(s).
Pheromones differ from hormones in that
A. they are transmitted between members of different species. B. they are transmitted between members of the same species. C. they are only found in plants and fungi. D. they act only within an individual.
Steroid hormones have hormone receptors in the:
a. nucleus of the cell b. cytoplasm of the cell c. cell membrane d. both A and C above
Which of the following is NOT true of the brachial plexus?
A. It is mainly derived from spinal nerves C5-C8, and T1. B. It gives rise to the musculocutaneous, axillary, radial, median and ulnar nerves. C. Its nerves control the shoulder and upper limb muscles. D. It contains the phrenic nerve and the ansa cervicalis. E. All of these are true of the brachial plexus.