1) Muscle contraction is initiated at the NMJ by the release of _______________ from synaptic vesicles. a. Epinephrine b...
1) Muscle contraction is initiated at the NMJ by the release of _______________ from synaptic vesicles.
a. Epinephrine
b. Acetylcholine
c. Calcium
d. Sodium
2) Which of the following types of muscle contractions describes force development with no change in the muscle’s length?
a. isokinetic
b. isometric
c. concentric
d. eccentric
3) Which of the following describes the ability of a muscle to contract repeatedly against an opposing force?
a. Muscular Endurance
b. Aerobic Endurance
c. Muscular Strength
d. Muscular Power
Homework Answers
1. Acetylcholine:
Calcium ions stored in sarcoplasmic reticulum are released, this initiates muscular contraction. Calcium binds to Synaptotagmin protein at synaptic vesicles causing the release of Acetylcholine to the synaptic cleft.
2.Isometric:
The word Isometric means the tension will be produced without causing change in the length of muscle fibre. So there will be no contraction of muscle fibres occurring.
3. Muscular endurance:
The ability of a muscle or a group of muscles to continue repeated contractions against some force for an extended time period is muscular endurance. It is a component of muscular fitness together with muscle strength and power.
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