MUSCLE PHYSIOLOGY

Detailed explanation-1: -Contractility is the ability to shorten forcibly when ade-quately stimulated. This ability sets muscle apart from all other tissue types. ● Extensibility is the ability to extend or stretch. Muscle cells shorten when contracting, but they can stretch, even beyond their resting length, when relaxed.

Detailed explanation-2: -Contractility represents the ability of the myocardial muscle to shorten or thicken against a load. Although ejection fraction (EF) is the most common clinical assessment of contractility in practice, it is highly dependent on ventricular afterload.

Detailed explanation-3: -Muscle extensibility: ability of a muscle to extend to a predetermined endpoint.

Detailed explanation-4: -Extensibility: this refers to the ability of muscle tissue to lengthen when contracting and provide the effort required to move the lever system (the bones and joints), producing coordinated movement.