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lilavasa [31]
3 years ago
5

In describing a contracted sarcomere vs. a relaxed sarcomere, the contracted lacks which structures/components, while they are p

resent in the relaxed sarcomere.
Where 1. A-band 2. I-band 3. Z discs 4. H-zone 5. M-line

A. 1 & 2
B. 3 & 4
C. 3, 4 & 5
D) 1 & 4
E) 2 & 4
Medicine
1 answer:
Aliun [14]3 years ago
5 0

Answer:

The correct answer will be option E- 2 & 4.

Explanation:

The sarcomere is a segment made up of thick and thin filaments between the two Z-lines or disc of a myofibril.

Sarcomere structurally can be divided into bands:  

  1. A-band- which is also known as the anisotropic filament is made up of thick filaments called myosin.
  2. H-zone- the zone in the A-band which appears lighter in color in the microscope  
  3. I-band- an isotropic band made of thin filament called actin.

Upon contraction of muscle, these filaments form an overlapped structure due to which I-band shortens along with H-zone of A- band. Due to the shortening of these bands, only A-band without H-zone and I-band appears between two A-lines. These bands upon relaxation again take their normal form.

Thus, option E- 2 & 4 is the correct answer.

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19. correct

20. correct

21. correct

22. correct

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Corrected some of your mistakes. Hope you don't mind.

4 0
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