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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?
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.
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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