One motor neuron, plus all the muscle fibers it innervates, is known as a(n):
a. nerve bundle
b. motor unit
c. activated component
d. cross bridge
e. functional unit
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Question 2) In Alzheimer patients, amyloid plaques may cause
a. a breakdown the blood-brain barrier
b. glutamate toxicity to neurons
c. degeneration of the neuron cell bodies
d. a breakdown in the blood-brain barrier and glutamate toxicity to neurons
e. glutamate toxicity to neurons and degeneration of the neuron cell bodies
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Question 3) The portion of a lever between the fulcrum and the point where a force is applied by the muscle is called the ____.
a. fulcrum angle
b. velocity
c. power arm
d. load arm
e. interactive unit
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Question 4) Which is not a function of the limbic system?
a. provides emotional responses
b. coordinates aspects of learning
c. provides pleasant sensation of reward
d. coordinates survival instincts
e. provides conscious perceptions
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Question 5) What happens to a muscle during an isometric contraction?
a. It produces more calcium.
b. It lengthens.
c. It shortens.
d. It is prevented from shortening.
e. Sarcomeres are destroyed.
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Question 6) Which is not a structural component of the limbic system?
a. amygdala
b. thalamus
c. hypothalamus
d. somatosensory cortex
e. hippocampus
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Question 7) Muscle tension is produced internally within the ____.
a. myosin molecules
b. actin molecules
c. T tubules
d. sarcoplasmic reticulum
e. sarcomeres
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Question 8) Which two structures below are in the cerebral cortex?
a. basal nuclei and Broca's area
b. thalamus and hypothalamus
c. Wernicke's area and Broca's area
d. reticular formation and limbic system
e. reticular formation and reticular activating system
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Question 9) How many skeletal muscles are there in the body?
a. about 400
b. 442
c. about 500
d. 535
e. about 600
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Question 10) Long-term potentiation
a. is to increased responsiveness to mild stimuli following a strong or noxious stimulus
b. is an increase in strength of existing synaptic connections in pathways involved in initial storage of declarative information following brief periods of stimulation
c. involves a retrograde chemical messenger from the postsynaptic neuron influencing the presynaptic neuron
d. exhibits characteristics a and b
e. exhibits characteristics b and c
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