Contraction of muscle results in movement because ________.
A) at a joint, the bone acts as a pulley and the joint serves as a lever
B) at a joint, the bone acts as a lever, the joint serves as a fulcrum, and effort is generated by muscle attached to bone
C) at a joint, the bone acts as a fulcrum and the joint serves as a pulley
D) at a joint, the bone acts as a fulcrum and the joint serves as a lever
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Question 2) The muscles of the head, neck, and trunk are referred to as the ________ muscles.
A) smooth
B) appendicular
C) axial
D) skeletal
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Question 3) The release of calcium ions from the sarcoplasmic reticulum in response to an action potential is known as ________.
A) power stroke
B) sliding filament theory
C) tropomyosin
D) excitation-contraction coupling
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Question 4) What is it called when the myosin heads pivot and pull on the actin filaments?
A) power stroke
B) tropomyosin displacement
C) action potential
D) troponin
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Question 5) What happens when a patient is poisoned by botulism?
A) increased respiratory rate
B) blurry, double vision
C) constricted pupils
D) increased acetylcholine release
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Question 6) What would most likely happen if there were a decrease in the number of acetylcholine receptors in an NMJ?
A) decreased neurotransmitter release into the synaptic cleft
B) increased sodium ion influx at the motor endplate
C) decreased action potential generation at the motor endplate
D) increased action potential generation at the motor endplate
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Question 7) Which neurotransmitter is released at the neuromuscular junction?
A) sodium
B) acetylcholine
C) glutamate
D) acetylcholinesterase
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Question 8) What is the name for the region of the sarcomere that contains only thick filaments?
A) Z line
B) A band
C) H band
D) I band
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Question 9) What structure contains proteins that stabilize the thin filaments?
A) Z line
B) M line
C) A band
D) I band
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Question 10) Which of the following is both a protein and a structural component of thin filaments?
A) actin
B) myosin
C) myofibrils
D) T-tubules
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