After nervous stimulation stops, what prevents ACh in the synaptic cleft from continuing to stimulate contraction?
A) the tropomyosin blocking the myosin once full contraction is achieved
B) acetylcholinesterase destroying the ACh
C) calcium ions returning to the terminal cisternae
D) the action potential stops going down the overloaded T tubules
B
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The increase in the number of motor units activated as a result of more intense stimulation is called
A. threshold stimulation. B. sustained contraction. C. latency. D. recruitment.
How do veins prevent the backflow of blood?
A) Gravity B) Pressure C) Valves D) Bulk flow
Loss of coordination and balance, but not paralysis is associated with:
a. damage to descending excitatory pathways b. excitatory inputs to motor neurons being unopposed because of disruption of an inhibitory system in the brain stem. c. damage to the spinal cord d. damage to the cerebellum e. loss of alpha motor neurons
Which of the following is classified as a protein?
A) cholesterol B) enzyme C) glucose D) triglyceride E) RNA