What structures extend into the axon and dendrite of a neuron to provide tensile strength?
A. Motor filaments
B. Nissl bodies
C. Telodendria
D. Neurofibrils
E. Collateral fibers
D
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The entire process of movement of the sperm and sex gland secretions out of the male reproductive tract is called ____________________; emptying of semen into the urethra is known as ____________________; forceful ejection of sperm from the penis is called ____________________
Fill in the blank(s) with correct word
All the following statements concerning the cerebellum are correct EXCEPT:
A) projects to the red nucleus B) projects to the vestibular nuclei C) projects to the lateral ventral nucleus of the thalamus D) receives input from the superior olivary nucleus E) receives the olivocerebellar tract via the inferior cerebellar peduncle
Which of the following statements is TRUE regarding skeletal-muscle contraction?
A. Only one cross-bridge cycle can occur when the [Ca2+] is elevated in the cytosol; in order to undergo a second cycle, [Ca2+] must be sequestered in the sarcoplasmic reticulum and released again. B. ATP hydrolysis products must be removed from myosin before it can bind to actin. C. Binding of myosin to actin takes place when [Ca2+] increases in the cytosol. D. A single twitch in skeletal muscle lasts the same length of time as the action potential that causes it. E. The powerstroke of the cross-bridge cycle occurs simultaneously with ATP being hydrolyzed into ADP and Pi.
Betsy took a fall, broke her arm, and when she took the cast off she was alarmed to see that her muscles
A. looked the same as they did before the fall. B. had undergone atrophy. C. undergone hypertrophy. D. seemed to have an increase in blood flow.