The minimum stimulus needed to cause a contraction is called the:
1. chronaxie
2. threshold
3. rheobase
4. reversal potential

Subtopic:  Excitation Contraction Coupling II |
 84%
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A sustained muscle contraction evoked when the motor nerve that innervates a skeletal muscle emits action potentials at a very high rate is called as:
1. a sustained contraction
2. fatigue
3. tetanic contraction
4. treppe

Subtopic:  Excitation Contraction Coupling I |
 55%
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The continuous and passive partial contraction of the muscles is called as:
1. tetany
2. tonus
3. sustained contraction
4. summation

Subtopic:  Excitation Contraction Coupling II |
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Stimulation by a nerve impulse is always required for the contraction of:
1. multi-unit smooth muscle
2. skeletal muscle
3. visceral smooth muscle
4. cardiac muscle

Subtopic:  Muscle Contraction: Other Considerations |
 76%
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A decrease in the mass of the muscle most commonly experienced when persons suffer temporary disabling circumstances is called as:

1. hypertrophy

2. atrophy

3. dystrophy

4. peristalsis

Subtopic:  Disorders of Muscular and Skeletal System |
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A neuromuscular disorder that causes weakness in the skeletal muscles is:

1. poliomyelitis 2. myasthenia gravis
3. multiple sclerosis​​​​​​ 4. muscular dystrophy
Subtopic:  Disorders of Muscular and Skeletal System |
 68%
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Immediately after the motor neuron passes an impulse to a muscle fiber:
1. the impulse travels over the sarcolemma in all directions.
2. calcium is released from the sarcoplasmic reticulum.
3. cross bridge forms between the actin and myosin.
4. troponin undergoes a conformational change.

Subtopic:  Skeletal Muscle: Sarcomere |
 52%
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Identify the incorrect statement:
1. A muscle fiber contracts in an all-or-none fashion.
2. A slight delay occurs between the reaching of impulse at the neuromuscular junction and muscle contraction.
3. Using more motor units will increase the overall force of contraction.
4. When a person is fully at rest, none of her muscles are contracting.

Subtopic:  Excitation Contraction Coupling I |
 63%
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Identify the incorrect statement regarding a skeletal muscle fiber:
1. They continue to divide throughout childhood as skeletal muscles grow
2. Theyare formed by fusion of myoblasts during fetal development
3. They are true syncytium.
4. They are striated.

Subtopic:  Skeletal Muscle: Basic Anatomy |
 50%
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What happens during the contraction of a skeletal muscle fiber?

1. The myosin filaments stay the same size but the actin filaments shorten
2. The sarcomeres shorten
3. The actin filaments stay the same size but the myosin filaments shorten
4. Both actin and myosin filaments shorten
Subtopic:  Excitation Contraction Coupling I |
 67%
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