Which describes the all-or-none law as it relates to muscle function?
A. All fibers in a motor unit contract or none of them do.
B. All fibers in a fascicle contract or none of them do.
C. The whole muscle contracts or it does not.
D. All myofibrils contract maximally or they do not contract at all.
Answer: A
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A corpus callosotomy is a procedure in which the corpus callosum is cut to decrease the severity of certain types of seizures. After the procedure, some patients have extreme difficulty performing actions related to the non-dominant hemisphere, like using their non-dominant hand. What might be the basis for this side effect?
A. The corpus callosum separates the two hemispheres. Cutting the structure allows the dominant hemisphere to interfere with the motor control within the non-dominant hemisphere. B. The corpus callosum handles some somatic motor neurons. Cutting the structure will stop motor function signals from one hemisphere. C. The corpus callosum contains neurons that cross from one hemisphere to the other. Cutting the structure prevents the dominant hemisphere from controlling motor function in the non-dominant hemisphere. D. The corpus callosum is the seat of control for fine motor function and positioning. Cutting the structure will prevent the onset of seizures, but also hinders fine motor function and causes confusion about where a body part is at any given time.
In males, loss of function in the pituitary gland would most likely result in ________.
A. inhibited gamete development B. increased gamete development C. increased stimulation of FSH D. decreased stimulation of GnRH
The functions of the nervous system include all of the following except:
a. regulation of the immune response b. integration of body function c. control of body functions d. all of the above are functions of the nervous system
Which of the following involves the greatest number of bones?
A) distal radioulnar articulation B) intercarpal articulations C) intertarsal articulations D) radiocarpal articulation E) knee joint