Which of the following statements about the striated muscles...

Name: Problem 17, Chapter 20: Objective NCERT at your FINGERTIPS: Biology
Uploaded: 2021-10-26T12:14:47-08:00
Duration: 1 min 59 s
Channel: Qudsiya Anis
Description: Which of the following statements about the striated muscles is incorrect? (a) In the centre of each I - band is an elastic fibre (Z-line) which bisects it. (b) Thin filaments are firmly attached to the Z-line. (c) M-line is a fibrous membrane in the middle of A-bands. (d) None of these

Which of the following statements about the striated muscles is incorrect? (a) In the centre of each I - band is an elastic fibre (Z-line) which bisects it. (b) Thin filaments are firmly attached to the Z-line. (c) M-line is a fibrous membrane in the middle of A-bands. (d) None of these

Which of the following statements about the striated muscles is incorrect?
(a) In the centre of each I - band is an elastic fibre (Z-line) which bisects it.
(b) Thin filaments are firmly attached to the Z-line.
(c) M-line is a fibrous membrane in the middle of A-bands.
(d) None of these

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Key Concepts

Sarcomere

The sarcomere is the basic contractile unit within a striated muscle fiber, defined by the region between two consecutive Z-lines. It contains precisely arranged thin (actin) and thick (myosin) filaments, whose interactions facilitate muscle contraction through a sliding mechanism.

I-band

The I-band is the lighter region of the sarcomere that contains only thin actin filaments. It spans the area adjacent to the Z-line and its length varies during contraction and relaxation, playing a key role in the overall contraction process.

Z-line

The Z-line, also known as the Z-disc, marks the boundary of each sarcomere and serves as the anchoring site for the thin filaments. It is essential for maintaining the structural integrity and alignment of the sarcomere during muscle contractions.

A-band

The A-band is the darker central region of the sarcomere where thick myosin filaments are predominately located. It also includes the overlapping region where both thin and thick filaments coexist, and its width remains relatively constant during contraction.

M-line

The M-line is situated in the center of the A-band and comprises a network of proteins that hold the thick myosin filaments together, ensuring the proper alignment and structural stability of the sarcomere during muscle contraction.

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