MUSCLE
SKELETAL MUSCLE
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
The portion of the myofibril between two successive ‘Z’ lines is considered as the functional unit of contraction and is called a sarcomere
|
|
|
The portion of the myofibril between two successive ‘M’ lines is considered as the functional unit of contraction and is called a sarcomere
|
|
|
The portion of the myofibril between two successive I-bands is considered as the functional unit of contraction and is called a sarcomere
|
|
|
The portion of the myofibril between two successive A-bands is considered as the functional unit of contraction and is called a sarcomere
|
Detailed explanation-1: -Thus, the correct answer is option A. i.e., Portion of myofibril between 2 successive Z-lines. Note: Sarcomere is the basic unit of contraction in the muscle fibre which is composed of two main proteins including actin and myosin and these structures are responsible for the contraction of muscle fibres.
Detailed explanation-2: -A sarcomere is the region from one Z line to the next Z line. Many sarcomeres are present in a myofibril, resulting in the striation pattern characteristic of skeletal muscle.
Detailed explanation-3: -Z-lines define the boundaries of each sarcomere. The M-line runs down the center of the sarcomere, through the middle of the myosin filaments. The I-band is the region containing only thin filaments. The H-zone contains only thick filaments.