Why do people with Parkinson disease experience resting tremors?
A. Damage to the cerebellum alternately activates agonist/antagonist muscle pairs.
B. Excess glutamate is released in the premotor areas of the motor cortex.
C. Dopamine-secreting tumors directly activate alpha motor neurons.
D. Acetylcholinesterase at neuromusclular junctions is inactivated.
E. Activation of the sensorimotor cortex is reduced when the substantia nigra fails to deliver dopamine to the basal nuclei.
E
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A) A. B) B. C) C. D) D. E) E.
Which organ system helps the body get rid of nitrogenous wastes?
A) Urinary B) Respiratory C) Endocrine D) Cardiovascular
Progesterone, in combination with estrogen, produces secondary sex characteristics in a female
Indicate whether the statement is true or false
The structure that controls the movement of materials into and out of cells is the ________.
A. endoplasmic reticulum B. plasma membrane C. nucleus D. cytoplasm