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Explain three functions of the muscular system
- 1. Motion- Allows you to move
- 2. Movement- Moves substances such as food and blood
- 3. Posture
- 4. Heat Production- About 85% of our 98.6° body temp
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What stimulates the release of the neurotransmitter?
Calcium ions
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The fibrous connective tissue that surrounds the entire muscle?
Epimysium
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The unit of contraction
Sacromere
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The thick myofilaments are made mostly of ____, and the thin filaments are _____.
Myosin; actin
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The ____ contains the entire length of the thick filaments; the ____ contains ONLY thin filaments
A-band; I-band
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The site where the neuron and muscle fiber meet is called the
Neuromuscular junction
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The neurotransmitter intimating muscle action potential is
acetylcholine
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When a muscle contracts, ____ unlocks the troponin and tropomyosin, while ____ energizes the "heads" to allow muscle contraction.
Ca2+, ATP
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During anaerobic exercise (no O2), what is produced in the muscle fibers?
Lactic acid
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As soon as ATP in the muscle fiber is used up, what molecule is next used as an energy source?
Creatine phosphate
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When contracting the deltoid, the ___ is the origin, and the ____ is the insertion.
Scapula, humerous
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Which is correct fir movement of calcium during stimulus/ contraction?
Into the nerve from the interstitial space, out of the muscle fiber sarcoplasmic reticulum
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Oxygen is stored in muscle fibers in this molecule
Myoglobin
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The perimycium wraps up a bundle of
Fascicle's, blood vessels & nerves
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The space between the nerve termination and the muscle cell membrane is the
Synaptic cleft
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A neurotransmitter is stored in the neuron before muscle stimulus in which structure?
Synaptic vesicle
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- 1. Axon of motor junction
- 2. Muscle Fiber
- 3. Neuromuscular Junction
- 4. Capillary
- 5. Myofibrils
- 6. Presynaptic Terminal
- 7. Sarcolemma
- 8. Synaptic Vesicles
- 9. Mitochondrion of muscle
- 10. Postsynaptic Membrane
- 11. Synaptic Cleft
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