The function of the gamma motor neuron is to
a. detect changes in the muscle fiber length.
b. stimulate the muscle to contract.
c. limit the degree of contraction of the muscle.
d. coordinate the contraction of extensor and flexor muscles.
e. control the sensitivity of the muscle spindle.
Answer: e. control the sensitivity of the muscle spindle.
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Ed has been prescribed methadone because he is addicted to heroin. How does it help? a. It reduces the cravings for heroin by substituting its own reduced sense of euphoria. b. It causes vomiting if heroin is used
c. It reduces the intensity of withdrawal symptoms. d. It stops his need to get high.
Alcohol probably produces its main effects by acting as an agonist at the ________ receptors
a. serotonin b. glutamate c. GABA d. dopamine
During the elementary-school years,
a. peer relations involve more conflicts than they did during the preschool years. b. friends most often spend time together participating in sports and academic activities. c. the number of peer relationships is smaller than it was during the preschool years. d. peers often engage in rough-and-tumble play.
Kaposi's sarcoma refers to a cancer of the
A. stomach. B. skin. C. blood vessels. D. lungs.