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Which of the following statements regarding muscle structure and contraction are correct?
i. The light bands in muscle fibers, known as I-bands, contain actin filaments.
ii. Cardiac muscles are voluntary muscles controlled directly by the nervous system.
iii. Each functional unit of contraction in a muscle fiber is called a sarcomere, defined by Z-lines.
iv. Myosin filaments are thinner than actin filaments and are referred to as thick filaments.
- a)i and iii
- b)ii and iv
- c)i and iv
- d)i and iii and iv
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
Which of the following statements regarding muscle structure and contr...
Understanding Muscle Structure and Contraction
When analyzing the statements regarding muscle structure and contraction, it's essential to assess the accuracy of each one.
Statement Analysis
- Statement i: "The light bands in muscle fibers, known as I-bands, contain actin filaments."
- Correct: I-bands are indeed the light bands in the sarcomere and primarily consist of actin filaments.
- Statement ii: "Cardiac muscles are voluntary muscles controlled directly by the nervous system."
- Incorrect: Cardiac muscles are involuntary muscles. They are regulated by the autonomic nervous system and not under direct voluntary control.
- Statement iii: "Each functional unit of contraction in a muscle fiber is called a sarcomere, defined by Z-lines."
- Correct: A sarcomere is the basic contractile unit of a muscle fiber, defined by Z-lines at either end.
- Statement iv: "Myosin filaments are thinner than actin filaments and are referred to as thick filaments."
- Incorrect: Myosin filaments are actually thicker than actin filaments and are classified as thick filaments.
Conclusion
Based on this analysis, the correct statements are i and iii. However, since the question specifies the correct answer as option 'A', which includes only statements i and ii, it appears that the understanding of statement ii is incorrect. Therefore, the answer should actually be reconsidered. The correct option would align more with statements i and iii rather than solely focusing on option 'A'.
For a comprehensive understanding, it's essential to recognize the properties of muscle fibers and their classifications. This knowledge is pivotal for NEET preparation and understanding human physiology.
When analyzing the statements regarding muscle structure and contraction, it's essential to assess the accuracy of each one.
Statement Analysis
- Statement i: "The light bands in muscle fibers, known as I-bands, contain actin filaments."
- Correct: I-bands are indeed the light bands in the sarcomere and primarily consist of actin filaments.
- Statement ii: "Cardiac muscles are voluntary muscles controlled directly by the nervous system."
- Incorrect: Cardiac muscles are involuntary muscles. They are regulated by the autonomic nervous system and not under direct voluntary control.
- Statement iii: "Each functional unit of contraction in a muscle fiber is called a sarcomere, defined by Z-lines."
- Correct: A sarcomere is the basic contractile unit of a muscle fiber, defined by Z-lines at either end.
- Statement iv: "Myosin filaments are thinner than actin filaments and are referred to as thick filaments."
- Incorrect: Myosin filaments are actually thicker than actin filaments and are classified as thick filaments.
Conclusion
Based on this analysis, the correct statements are i and iii. However, since the question specifies the correct answer as option 'A', which includes only statements i and ii, it appears that the understanding of statement ii is incorrect. Therefore, the answer should actually be reconsidered. The correct option would align more with statements i and iii rather than solely focusing on option 'A'.
For a comprehensive understanding, it's essential to recognize the properties of muscle fibers and their classifications. This knowledge is pivotal for NEET preparation and understanding human physiology.
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Community Answer
Which of the following statements regarding muscle structure and contr...
- Statement i is correct because the I-band is indeed composed of actin filaments, which are thinner than myosin filaments.
- Statement ii is incorrect; cardiac muscles are involuntary and are not directly controlled by the nervous system.
- Statement iii is correct as the sarcomere is defined as the segment between two Z-lines and is the functional unit of contraction.
- Statement iv is incorrect; myosin filaments are actually thicker than actin filaments.
Thus, the correct statements are i and iii, making Option A the correct answer.
Line in NCERT: "The light bands contain actin and is called I-band or Isotropic band, whereas the dark band called 'A' or Anisotropic band contains myosin." "Each functional unit of contraction and is called a sarcomere (Figure 17.2)." "Actin filaments are thinner as compared to the myosin filaments, hence are commonly called thin and thick filaments respectively."
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Which of the following statements regarding muscle structure and contraction are correct? i. The light bands in muscle fibers, known as I-bands, contain actin filaments. ii. Cardiac muscles are voluntary muscles controlled directly by the nervous system. iii. Each functional unit of contraction in a muscle fiber is called a sarcomere, defined by Z-lines. iv. Myosin filaments are thinner than actin filaments and are referred to as thick filaments.a) i and iiib) ii and ivc) i and ivd) i and iii and ivCorrect answer is option 'A'. Can you explain this answer? for NEET 2026 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about Which of the following statements regarding muscle structure and contraction are correct? i. The light bands in muscle fibers, known as I-bands, contain actin filaments. ii. Cardiac muscles are voluntary muscles controlled directly by the nervous system. iii. Each functional unit of contraction in a muscle fiber is called a sarcomere, defined by Z-lines. iv. Myosin filaments are thinner than actin filaments and are referred to as thick filaments.a) i and iiib) ii and ivc) i and ivd) i and iii and ivCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for NEET 2026 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which of the following statements regarding muscle structure and contraction are correct? i. The light bands in muscle fibers, known as I-bands, contain actin filaments. ii. Cardiac muscles are voluntary muscles controlled directly by the nervous system. iii. Each functional unit of contraction in a muscle fiber is called a sarcomere, defined by Z-lines. iv. Myosin filaments are thinner than actin filaments and are referred to as thick filaments.a) i and iiib) ii and ivc) i and ivd) i and iii and ivCorrect answer is option 'A'. Can you explain this answer?.
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