The pyramidal system provides
A) voluntary control over skeletal muscles.
B) voluntary control over smooth muscles.
C) involuntary control over skeletal muscles.
D) involuntary control over smooth muscles.
E) involuntary control over cardiac muscle.
Answer: A
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The flexor digitorum longus is located in the
A. deep layer of the posterior compartment of the leg, and it flexes toes 2-5. B. deep layer of the posterior compartment of the leg, and it flexes toes 1-3. C. superficial layer of the posterior compartment of the leg, and it flexes toes 2-5. D. superficial layer of the posterior compartment of the leg, and it flexes toes 1-3. E. anterior compartment of the leg, and it flexes toes 1-5.
The direct motor pathway originates in the
A. motor cortex of the cerebral cortex. B. superior colliculus of the midbrain. C. vestibular nuclei of the brainstem. D. reticular formation of the brainstem.
The most common solvent in the body, in which solutes or other substances will dissolve, is:
A. blood. B. water. C. plasma. D. bile.
Why do people with Parkinson's disease experience resting tremors?
A. Damage to the cerebellum alternately activates agonist/antagonist muscle pairs. B. Acetylcholinesterase at neuromuscular junctions is inactivated. C. Activation of the sensorimotor cortex is reduced when the substantia nigra fails to deliver dopamine to the basal nuclei. D. Excess glutamate is released in the premotor areas of the motor cortex. E. Dopamine-secreting tumors directly activate alpha motor neurons.