Want to watch this video? Sign up for the course here. Or enter your email below to watch one free video.

Unlock This Video Now for FREE

This video is normally available to paying customers.
You may unlock this video for FREE. Enter your email address for instant access AND to receive ongoing updates and special discounts related to this topic.

Muscle is described as being elastic which means that it can stretch and then recoil to its original length and can be compared with an elastic band, but like an elastic band if the muscle is pulled too far it can tear.

Muscles can also contract, pulling muscle ends closer together. These muscle ends pull on the tendons and bones to which they are attached, allowing locomotion and other body movements. The contraction and relaxation of skeletal muscle are in response to certain stimuli, such as neurotransmitters and hormones or even changes in the pH level.

The ability to apply a large force in a short time or sustained force over a long duration is possible because of the muscles capacity to vary energy expenditure according to demand. During this production of energy, there is a large amount of heat generated which must be distributed throughout the body and the excellent supply of blood within skeletal muscles allows this to occur. Muscles are therefore described as, being vascular indicating that they have a good blood supply.

There are hundreds of skeletal muscles which allow for a multitude of body movements through contraction and relaxation of voluntary muscle fibres. They make up on average more than 40% of the male body weight and less in the body of a female. The main constituents of skeletal muscle are 70% water, 23% protein that is actin and myosin and Minerals which includes calcium, potassium, phosphorus and substances such as glycogen, glucose and. fatty acids make up the final 7%.

There is connected tissue throughout various parts of the muscles. Connective tissue is continuous throughout the length of the muscle. Layers of connective tissue converge to form tendons. Tendons are strong inelastic and strap-like structures. The tendon then attaches to the sheath that surrounds the bone.