MUSCLES IN THE HUMAN BODY.

MUSCLES.• There are 640 muscles in the average male body.

• All of this muscle weight accumulates to 2/5 of the individuals overall weight.

• There two muscle groups, flexor and extender.

The biceps are flexors and the triceps are extenders.

TYPES OF MUSCLES.• There are three types of muscles in the body.

• Skeletal muscles control voluntary actions in the body.

• Smooth muscles control involuntary actions.

• Cardiac muscles control your heart.

Skeletal

Smooth

Cardiac

MUSCLES IN THE FACE.• The muscles in the face are very complicated to allow you to be able to make the many

facial expressions that you can.

• They intertwine and over lap to move your jaw in the many directions that it can be.

MUSCLE CONTRACTION.• Muscles can be both contracted and relaxed in different positions.

• They are attached to the bone by tendons which are made of collagen.

• In a fully relaxed muscle the muscle fibers do not overlap at all.

Stretched Partly contracted Fully contracted.

MUSCLE FIBERS• Muscle fibers make up muscles.

• Muscle fibers are 1 ½ cm long and 1/500 cm in diameter.

• When muscles are contracted the fibers get shorter and wider

JOINTS• All muscles move bones which revolve around a joint.

• A joint is generally where a muscle comes to an end and where to or more bones meet.

A COUPLE VIDEOS• http://www.youtube.com/watch?v=CepeYFvqmk4

• http://www.youtube.com/watch?v=EhfFpKwQJLY