Word Bank: - Acetylcholine, Actin, Action potential, ATP, Calcium, Cross-Bridge,
ID: 3524833 • Letter: W
Question
Word Bank:
- Acetylcholine, Actin, Action potential, ATP, Calcium, Cross-Bridge, Motor Endplate, Motor Unit, Myosin, Neuromuscular Junction, Power Stroke, Sarcoplasmic Reticulum, Synaptic Cleft, Transverse Tubule, Tropomyosin, Troponin
Fill in the blanks:
Regardless of the type of exercise, the workings of these amateur athletes’ muscles is the same:
Before the muscle can contract, a/an ________ must travel down a motor neuron from the spinal cord to the muscle in question. Near the end of the motor neuron, its axon splits into numerous branches, each of which forms a _________ with a single muscle fiber. All of these branches together activate a group of muscle fibers that always contract at the same time; this group is called a __________.
Each axon terminal comes together with a muscle fiber, forming a connection called a ___________. When the nerve signal reaches the axon terminal, a neurotransmitter called _________ is released into a tiny space called the __________, where it binds to receptors on the ___________. This causes an ___________ to spread along the sarcolemma and down into each _________, where it triggers the ________ to release the ion ___________ into the sarcoplasm.
This ion binds to ____________, causing it to move the “chaperone” ___________ out of the way. Now, the ___________ cycle can begin:
first, the "head" of the thick filament protein ____________ binds to the main thin filament protein, ____________.
second, the heads of the thick filament protein rotate toward the M line, causing a small muscle contraction. This step is called the _____________.
third, a molecule of ____________ binds to the thick filament protein, breaking the "cross bridge" between the two filaments.
fourth, energy from the breakdown of ______________ is used to "rewind" and "spring load" the thick filament protein so the cycle can begin again.
Regardless of the type of exercise, the workings of these amateur athletes’ muscles is the same:
Before the muscle can contract, a/an ________ must travel down a motor neuron from the spinal cord to the muscle in question. Near the end of the motor neuron, its axon splits into numerous branches, each of which forms a _________ with a single muscle fiber. All of these branches together activate a group of muscle fibers that always contract at the same time; this group is called a __________.
Each axon terminal comes together with a muscle fiber, forming a connection called a ___________. When the nerve signal reaches the axon terminal, a neurotransmitter called _________ is released into a tiny space called the __________, where it binds to receptors on the ___________. This causes an ___________ to spread along the sarcolemma and down into each _________, where it triggers the ________ to release the ion ___________ into the sarcoplasm.
This ion binds to ____________, causing it to move the “chaperone” ___________ out of the way. Now, the ___________ cycle can begin:
first, the "head" of the thick filament protein ____________ binds to the main thin filament protein, ____________.
second, the heads of the thick filament protein rotate toward the M line, causing a small muscle contraction. This step is called the _____________.
third, a molecule of ____________ binds to the thick filament protein, breaking the "cross bridge" between the two filaments.
fourth, energy from the breakdown of ______________ is used to "rewind" and "spring load" the thick filament protein so the cycle can begin again.
Explanation / Answer
1. Action potential
2. Neuromuscular junction
3. Motor unit
4. Neuromuscular junction
5. Acetylcholine
6. Synaptic cleft
7. Motor end plate
8. Action potential
9. Transverse tubule
10. Sarcoplasmic reticulum
11. Calcium
12. Troponin
13. Tropomyosin
14. Cross bridge
15. Myosin
16. Actin
17. Power stroke
18. ATP
19. ATP
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