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Which ion is necessary for the contraction of a muscle and nerve impulse transmission?
- a)N+
- b)K+
- c)Ca++
- d)None of the above
Correct answer is option 'C'. Can you explain this answer?
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Most Upvoted Answer
Which ion is necessary for the contraction of a muscle and nerve impul...
Calcium ion (Ca++)
Muscle Contraction:
- Calcium ions play a crucial role in muscle contraction.
- When a muscle is stimulated, calcium ions are released from the sarcoplasmic reticulum in muscle cells.
- These ions bind to the protein complex troponin, causing a conformational change that exposes binding sites for myosin on actin filaments.
- This interaction allows myosin to bind to actin, leading to muscle contraction.
Nerve Impulse Transmission:
- Calcium ions are also essential for nerve impulse transmission.
- In nerve cells, calcium ions play a role in the release of neurotransmitters from vesicles at the synapse.
- When an action potential reaches the axon terminal, voltage-gated calcium channels open, allowing calcium ions to enter the cell.
- The influx of calcium triggers the fusion of vesicles containing neurotransmitters with the cell membrane, releasing the neurotransmitters into the synaptic cleft.
- These neurotransmitters then bind to receptors on the postsynaptic cell, leading to the propagation of the nerve impulse.
Conclusion:
- In summary, calcium ions are necessary for both muscle contraction and nerve impulse transmission, making them essential for the proper functioning of the muscular and nervous systems.
Muscle Contraction:
- Calcium ions play a crucial role in muscle contraction.
- When a muscle is stimulated, calcium ions are released from the sarcoplasmic reticulum in muscle cells.
- These ions bind to the protein complex troponin, causing a conformational change that exposes binding sites for myosin on actin filaments.
- This interaction allows myosin to bind to actin, leading to muscle contraction.
Nerve Impulse Transmission:
- Calcium ions are also essential for nerve impulse transmission.
- In nerve cells, calcium ions play a role in the release of neurotransmitters from vesicles at the synapse.
- When an action potential reaches the axon terminal, voltage-gated calcium channels open, allowing calcium ions to enter the cell.
- The influx of calcium triggers the fusion of vesicles containing neurotransmitters with the cell membrane, releasing the neurotransmitters into the synaptic cleft.
- These neurotransmitters then bind to receptors on the postsynaptic cell, leading to the propagation of the nerve impulse.
Conclusion:
- In summary, calcium ions are necessary for both muscle contraction and nerve impulse transmission, making them essential for the proper functioning of the muscular and nervous systems.
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Community Answer
Which ion is necessary for the contraction of a muscle and nerve impul...
In order for skeletal muscles to contract and nerve impulses to travel across synapses, calcium ions are necessary.
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Which ion is necessary for the contraction of a muscle and nerve impulse transmission?a)N+b)K+c)Ca++d)None of the aboveCorrect answer is option 'C'. Can you explain this answer?
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