A motor unit is
A. a motor neuron and the muscle fibers it innervates.
B. many myofibrils in a sarcolemma.
C. the functional unit of a muscle fiber.
D. many motor end plates at a neuromuscular junction.
Answer: A
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Indicate whether the statement is true or false
The basal nuclei
A) initiate conscious motor activity. B) activate spinal reflexes. C) adjust and refine learned motor activities. D) exert direct control over lower motor neurons. E) act as gatekeepers, filtering out unnecessary sensory input.
An autoimmune disease that destroys acetylcholine receptors on skeletal muscles is
A. fibromyalgia. B. osteoarthritis. C. muscular dystrophy. D. myasthenia gravis.
Renin hydrolyzes angiotensinogen, which is released from the ________, to form angiotensin I
A) spleen B) liver C) lungs D) kidneys E) heart