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Exam 8: Muscle Physiology

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Question 161

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The neurotransmitter called ____________________ stimulates skeletal muscles to contract.

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Question 162

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Indicate which type of muscle is associated with the property in question by writing the appropriate letter in the blank using the answer code below: a.skeletal muscle only b.single-unit smooth muscle only c.cardiac muscle only d.skeletal muscle and cardiac muscle e.skeletal muscle and single-unit smooth muscle f.single-unit smooth muscle and cardiac muscle g.skeletal, single-unit smooth, and cardiac muscles -Is neurogenic

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Question 163

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According to the sliding-filament mechanism, the

A(n) ____________________ is a motor neuron and all the muscle fibers it recruits.

During an isotonic contraction,

Match the sarcomere component with the correct characteristic. a.Z line b.A band c.I band d.H zone -Contains partially overlapping thick and thin filaments

Indicate which of the characteristics in question apply to each of the muscle fiber types by using the following answer code: a.Slow-oxidative fiber b.Fast-oxidative fiber c.Fast-glycolytic fiber d.Slow-oxidative fiber and fast-oxidative fiber e.Fast-oxidative fiber and fast-glycolytic fiber f.Slow-oxidative fiber, fast-oxidative fiber and fast-glycolytic fiber -Has the largest diameter

Indicate which of the muscle proteins in skeletal muscle is associated with the item in question by writing the appropriate letters in the blanks using the answer code below: a.actin only b.myosin only c.actin and myosin d.troponin-tropomyosin complex e.actin, troponin, and tropomyosin f.actin, myosin, troponin, and tropomyosin -Possess cross bridges

For every muscle there is an optimal length at which maximum ____________________ is achieved.

Select the correct statement regarding smooth muscle.

Indicate which characteristic applies to the specific type of muscle contraction: a.isometric b.isotonic c.eccentric d.concentric e.isometric and eccentric f.isotonic and concentric g.isotonic, eccentric, and concentric -Length remains constant

Myosin is considered to be a regulatory protein because it plays an important role in the regulation of muscle contraction.

The loss of excitatory stimulation of skeletal muscles by higher brain centers is called ______ paralysis.

Indicate the characteristics of the muscle-tension receptors using the following answer code: a.muscle spindle b.Golgi tendon organ c.both of these receptors -Initiates a monosynaptic reflex

Twitch summation

Muscle spindles consists of specialized muscle fibers called _______ fibers, which lie parallel to ordinary contractile muscle fibers called ______ fibers.

Acetylcholinesterase removes ACh from receptors.

Twitch summation is similar to the ____________________ summation of EPSPs.

____________________ refers to the series of events linking muscle excitation to muscle contraction.

____ is not required for contraction of smooth muscle fibers.