Question

How do muscles change their shape?

Answer 1

The muscle cells move by contraction and relaxation by utilizing the energy in the form of ATP. Muscle contraction is initiated by the signal sent by the CNS to the muscle fibres. During contraction, the muscles fibres shorten, the muscle pulls on the ligaments that connect the bones and the movable body parts. During relaxation the muscle fibres come to their original position. This movement of muscles cells or the muscle fibres results in the movement of the body parts.

Answer 2

The shape of muscles depends on ability to adapt to external forces, when placed under high demand, the
generate great strength and power and maintain durability. Muscle is a soft tissue and their cells contain protein,filaments of actin and myosin that slide past one another, producing contraction that changes both the length and shape of the cell.