Question

The dark bands (Black bands) (A-bands) of a
skeletal muscle are known as
(a) Isotropic bands (b) Anisotropic bands
(c) Intercalated disc (d) Cross bridges

Answer 1

Answer:

dark band are striated muscles located in arms

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Explanation:

Answer 2

The dark bands (Black bands) (A-bands) of a skeletal muscle are known as Anisotropic bands.

* The myofibril of skeletal muscles have two bands:

1. Isotropic bands( I bands)- lighter bands consisting of thin actin filaments and no thick myofilaments.

2. Anisotropic bands( A bands)- dark bands consisting of thick myosin filaments.

* The myofibrils are therefore formed of actin and myosin filaments, which appear as dark or light depending on the refraction of light.

* The centre of the I band is formed by the Z line( containing the anchor protein α-actinin) whereas the centre of the A band is formed by H zone and M line having the required enzymes.