MICROANATOMY

Detailed explanation-1: -A concentric contraction causes muscles to shorten, thereby generating force. Eccentric contractions cause muscles to elongate in response to a greater opposing force. Isometric contractions generate force without changing the length of the muscle.

Detailed explanation-2: -A muscle contracture, also known as a contracture deformity, is a permanent shortening and tightening of muscle fibers that reduces flexibility and makes movement difficult. It is caused when a muscle loses elasticity. If a muscle cannot move and be stretched, the nearby joints also lose mobility and become painful. 1.

Detailed explanation-3: -The motion of muscle shortening occurs as myosin heads bind to actin and pull the actin inwards. This action requires energy, which is provided by ATP. Myosin binds to actin at a binding site on the globular actin protein.

Detailed explanation-4: -If the muscle length shortens, the contraction is concentric; if the muscle length lengthens, the contraction is eccentric. In natural movements that underlie locomotor activity, muscle contractions are multifaceted as they are able to produce changes in length and tension in a time-varying manner.