MUSCLES AND MUSCLE TISSUE. Muscle is composed of fibers, nerves and connective tissues and account for over 40% of the body weight. The fibers contract to produce tension on the associated tissues or tendons. Muscle tissue is enclosed in facia, which in turn is attached to other structures including ligament.There are three types of muscle tissues: skeletal, cardiac and smooth muscles. Muscle tissue provides a) posture and body support b) locomotion and c) heat production.eat production: The contraction of muscle produce heat, which keeps the body warm during the winter cold months. The production of heat is also an indication of active metabolic activity in the muscle tissue.