GENERAL HISTOLOGY

MUSCLE

SKELETAL MUSCLE

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Dark bands are also called the
A
I band
B
A band
C
Z disc
D
H zone
Explanation: 

Detailed explanation-1: -The darker bands are called anisotropic bands (A bands). Together the I-bands and A-bands contribute to the striated appearance of skeletal muscle. Isotropic bands indicate the behavior of polarized light as it passes through I bands.

Detailed explanation-2: -The dark A band consists of parallel myosin thick filaments, in a hexagonal arrangement in cross-section. The thick filaments of a single sarcomere are connected to each other by means of the M disc at their centres.

Detailed explanation-3: -Hint: The muscle fibres contain parallelly arranged myofibrils which have alternate light and dark bands. The dark present on the myofibril is called ‘A-band’ or anisotropic band and the light band present on the myofibril is called I-band or isotropic band.

There is 1 question to complete.