The membrane is more permeable to K+ than to Na+
a. at resting potential.
b. during the rising phase of an action potential.
c. during the falling phase of an action potential.
d. both (a) and (b).
e. both (a) and (c).
E
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Why are you able to repeatedly contract and relax your muscles of respiration, allowing you to breathe in and breathe out?
a. As soon as all of the Ca2+ stored in the lateral sacs of the sarcoplasmic reticulum is used up, muscle relaxation occurs. b. After the muscle cell becomes excited, acetylcholinesterase rapidly destroys acetylcholine. c. When there is no longer a local action potential in the muscle cell, Ca2+ is actively transported back into the lateral sacs of the sarcoplasmic reticulum, and muscle relaxation occurs. d. Both (b) and (c) above. e. All of these answers.
Which of the following are organs of the central nervous system?
A) brain, cranial nerves, spinal cord, and spinal nerves B) brain and cranial nerves C) brain and spinal cord D) spinal cord and spinal nerves
Which of the following is the term for the articulation of the clavicles with the scapulae?
A) acromioclavicular joint B) sternoclavicular joint C) acromiosternal joint D) sternoacromial joint E) costalclavicular joint
The ________ are in the visual pathway and mediate the pupillary light reflexes.
Fill in the blank(s) with the appropriate word(s).