A motor unit is ________
A) all the axons of nerve cells that innervate a muscle
B) a single motor neuron and all the muscle cells it innervates
C) a period of time during muscle contraction
D) a group of linked muscle cells
Answer: B
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A person picks up a heavy suitcase in order to estimate its weight and reflexively drops it. Which of the following receptors has initiated this reflex?
A) lamellae corpuscle B) free nerve ending C) tendon organ D) bulbous corpuscle
Sympathetic stimulation of the muscularis externa promotes __________.
a. increased muscular tone and activity b. muscular inhibition and relaxation c. muscular contraction and increased excitation d. increased digestive and gastric motility
The ventilation/perfusion ratio is ________ at the apex of the lungs.
A. the same as the base B. lowest C. highest
Botulism is a result of an exotoxin
Indicate whether the statement is true or false