Chapter 15 By: Harold Hoy

The human body

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• Your body is made up of trillions of cells which are organized into tissues.

• A tissue is a group of similar cells that perform the same function.

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• Muscle tissue- the only kind of tissue in your body that knows how to contract or shorten.

• By contracting and thus pulling on bones one type of muscle tissue knows how to make your body move.

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• Nerve Tissue- carries messages back and forth between the brain and spinal cord and every other part of your body.

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The skeletal System

• The bodies living frame work.

• This complicated structure contains more than 200 bones.

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• The skeletal system has 5 important functions:– It provides shape and support, allows

movement, protects organs and tissue, stores certain materials, and produces blood cells.

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• Development of bones:– Many bones are formed from a type of

connective tissue called cartilage.– Cartilage is a very hard, stiff, jelly like

material.

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The muscular System

• In the human body there are three types of muscular tissues:– Skeletal muscle– Smooth muscle– Cardiac muscle

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• Each type of muscle tissue has a characteristic structure and function.

• The muscle that attaches to and moves bones is called skeletal muscle.

• Smooth muscle- does not have bands, also called involuntary muscle.

• Cardiac muscle- is found only in the heart, branches out in many directions.

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• In order for skeletal muscle to bring about any kind of movement, the action of two muscles or two groups of muscles is needed.

• Skeletal muscles contract only when the receive a message from a nerve to do so. The nerve carries messages from the brain to the spinal chord to the muscles signaling them to contract.

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The end

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