Which statement is correct for muscle contraction
Length of H-zone become decrease
Length of A-band remains constant
Length of I-band become increase
Length of two Z-line become increase
The Correct Option is B
Solution and Explanation
The myofibril is composed of both thick and thin bands. The thick band is referred to as the dark band, while the thin band is known as the I band. Within the A-band, there exists a paler zone called the H-band located at its center. The I band is divided in its center by dense and narrow lines. The A-band is primarily formed by thick myosin filaments. As muscle contractions occur, actin filaments slide over the myosin filaments, leading to the shortening of a sarcomere. Therefore, the accurate statement is that the 'Length of the A-band remains constant.
So, the correct option is (B): Length of A-band remains constant
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Concepts Used:
Locomotion and Movement
Locomotion
The movement of a creature from one place to another is known as locomotion. During the process, there is the action of appendages such as wings, limbs, and flagella. In some animals, like fish, whales, and sharks, locomotion upshots from a wave-like series of muscle contractions. Locomotion helps an organism in finding their food, avoid harsh weather conditions, escape from their predators, etc.
Some examples of locomotion are walking, running, swimming, etc. Movement, on the other hand, refers to any type of motion that need not be localized.
Read More: Locomotion and Movement
Movement
Movement is generally described as a state of changing the position from rest to motion or vice-versa. Movement can be both voluntary movement and involuntary movement. Movement helps an organism perform essential functions, such as pumping blood to the different parts of the body, etc.
Read More: Difference between Locomotion and Movement