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Which of the statements given above is/are correct?
i. Muscle contraction begins with a signal from the central nervous system transmitted through a motor neuron.
ii. The neuromuscular junction is the site where the motor neuron and muscle fibre communicate.
iii. Calcium ions released into the sarcoplasm directly bind to myosin to initiate contraction.
iv. Troponin plays a critical role in exposing active sites on actin filaments for myosin binding.
- a)i and ii
- b)ii and iv
- c)i, ii, and iv
- d)iii and iv
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
Which of the statements given above is/are correct?i. Muscle contracti...
- Statement i is correct because muscle contraction is initiated by a neural signal from the CNS through a motor neuron.
- Statement ii is correct as the neuromuscular junction is indeed where the motor neuron connects to the muscle fibre.
- Statement iii is incorrect because calcium ions do not bind to myosin; they bind to troponin, which then allows myosin to attach to actin.
- Statement iv is correct as troponin binds calcium, causing a conformational change that exposes the active sites on actin.
Thus, the correct statements are i, ii, and iv.
Line in NCERT: "Muscle contraction is initiated by a signal sent by the central nervous system (CNS) via a motor neuron. The junction between a motor neuron and the sarcolemma of the muscle fibre is called the neuromuscular junction or motor-end plate. This causes the release of Ca** from sarcoplasmic reticulum. Ca** activates actin which binds to the myosin head to form a cross bridge."
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Which of the statements given above is/are correct?i. Muscle contracti...
Understanding Muscle Contraction
Muscle contraction is a complex process involving signals from the nervous system and interactions at the molecular level. Let’s evaluate the statements.
Statement i: Correct
- Muscle contraction indeed begins with a signal from the central nervous system, which is transmitted through a motor neuron to muscle fibers.
Statement ii: Correct
- The neuromuscular junction is the critical site where communication occurs between the motor neuron and the muscle fiber. This junction is essential for muscle activation.
Statement iii: Incorrect
- Calcium ions do not bind directly to myosin. Instead, they bind to troponin, which leads to a conformational change that allows myosin to interact with actin.
Statement iv: Correct
- Troponin plays a vital role in muscle contraction by exposing the active sites on actin filaments. When calcium binds to troponin, the tropomyosin shifts, enabling myosin heads to attach to actin.
Conclusion
Based on the evaluations:
- Correct statements are i, ii, and iv.
- Therefore, the correct answer is option 'C' (i, ii, and iv).
This understanding of muscle contraction is crucial for grasping how movements are initiated and executed in living organisms.
Muscle contraction is a complex process involving signals from the nervous system and interactions at the molecular level. Let’s evaluate the statements.
Statement i: Correct
- Muscle contraction indeed begins with a signal from the central nervous system, which is transmitted through a motor neuron to muscle fibers.
Statement ii: Correct
- The neuromuscular junction is the critical site where communication occurs between the motor neuron and the muscle fiber. This junction is essential for muscle activation.
Statement iii: Incorrect
- Calcium ions do not bind directly to myosin. Instead, they bind to troponin, which leads to a conformational change that allows myosin to interact with actin.
Statement iv: Correct
- Troponin plays a vital role in muscle contraction by exposing the active sites on actin filaments. When calcium binds to troponin, the tropomyosin shifts, enabling myosin heads to attach to actin.
Conclusion
Based on the evaluations:
- Correct statements are i, ii, and iv.
- Therefore, the correct answer is option 'C' (i, ii, and iv).
This understanding of muscle contraction is crucial for grasping how movements are initiated and executed in living organisms.
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Which of the statements given above is/are correct?i. Muscle contraction begins with a signal from the central nervous system transmitted through a motor neuron.ii. The neuromuscular junction is the site where the motor neuron and muscle fibre communicate.iii. Calcium ions released into the sarcoplasm directly bind to myosin to initiate contraction.iv. Troponin plays a critical role in exposing active sites on actin filaments for myosin binding.a) i and iib) ii and ivc) i, ii, and ivd) iii and ivCorrect answer is option 'C'. Can you explain this answer? for NEET 2025 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about Which of the statements given above is/are correct?i. Muscle contraction begins with a signal from the central nervous system transmitted through a motor neuron.ii. The neuromuscular junction is the site where the motor neuron and muscle fibre communicate.iii. Calcium ions released into the sarcoplasm directly bind to myosin to initiate contraction.iv. Troponin plays a critical role in exposing active sites on actin filaments for myosin binding.a) i and iib) ii and ivc) i, ii, and ivd) iii and ivCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for NEET 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which of the statements given above is/are correct?i. Muscle contraction begins with a signal from the central nervous system transmitted through a motor neuron.ii. The neuromuscular junction is the site where the motor neuron and muscle fibre communicate.iii. Calcium ions released into the sarcoplasm directly bind to myosin to initiate contraction.iv. Troponin plays a critical role in exposing active sites on actin filaments for myosin binding.a) i and iib) ii and ivc) i, ii, and ivd) iii and ivCorrect answer is option 'C'. Can you explain this answer?.
Which of the statements given above is/are correct?i. Muscle contraction begins with a signal from the central nervous system transmitted through a motor neuron.ii. The neuromuscular junction is the site where the motor neuron and muscle fibre communicate.iii. Calcium ions released into the sarcoplasm directly bind to myosin to initiate contraction.iv. Troponin plays a critical role in exposing active sites on actin filaments for myosin binding.a) i and iib) ii and ivc) i, ii, and ivd) iii and ivCorrect answer is option 'C'. Can you explain this answer? for NEET 2025 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about Which of the statements given above is/are correct?i. Muscle contraction begins with a signal from the central nervous system transmitted through a motor neuron.ii. The neuromuscular junction is the site where the motor neuron and muscle fibre communicate.iii. Calcium ions released into the sarcoplasm directly bind to myosin to initiate contraction.iv. Troponin plays a critical role in exposing active sites on actin filaments for myosin binding.a) i and iib) ii and ivc) i, ii, and ivd) iii and ivCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for NEET 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which of the statements given above is/are correct?i. Muscle contraction begins with a signal from the central nervous system transmitted through a motor neuron.ii. The neuromuscular junction is the site where the motor neuron and muscle fibre communicate.iii. Calcium ions released into the sarcoplasm directly bind to myosin to initiate contraction.iv. Troponin plays a critical role in exposing active sites on actin filaments for myosin binding.a) i and iib) ii and ivc) i, ii, and ivd) iii and ivCorrect answer is option 'C'. Can you explain this answer?.
Solutions for Which of the statements given above is/are correct?i. Muscle contraction begins with a signal from the central nervous system transmitted through a motor neuron.ii. The neuromuscular junction is the site where the motor neuron and muscle fibre communicate.iii. Calcium ions released into the sarcoplasm directly bind to myosin to initiate contraction.iv. Troponin plays a critical role in exposing active sites on actin filaments for myosin binding.a) i and iib) ii and ivc) i, ii, and ivd) iii and ivCorrect answer is option 'C'. Can you explain this answer? in English & in Hindi are available as part of our courses for NEET.
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