Human Body Systems

Levels of Organization

1- cells

2- tissues

3- organs

4- organ systems

5- organism

Each system works together to help us function and survive

Skeletal System

Skeletal System

• The framework of your body and it is made of 206 living bones (300 in babies)

5 Functions of the skeletal system

1. Gives shape and support to your body

2. Protects your internal organs

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3. Muscles attached to your bones help you move

4. Marrow in the center of bones makes blood cells (2.5 million/second)

5. Bones store calcium and phosphorus for our body

- Ca helps our heart and muscles work- P helps our cells produce and store energy- When stored in our bones, Ca and P help make bones

stronger

Muscular System

Over 600 muscles make movement possible

2 Functions of the Muscular System

1. Helps your body move

2. Produces heat for your body (through exercise or shivering)

Integumentary System• Our largest system, made up of one

organ:– Skin

4 Functions

1. Protection

2. Sensory Response

3. Vitamin D formation

http://www.nature.com/news/skeletons-show-rickets-struck-the-medici-family-1.13156

4. Maintain body temperature- using blood vessels constricting and sweating

Digestive SystemHelps provide energy for our body

1 Function:• Break down food into small molecules so it

can be absorbed and moved by the blood stream which delivers it to your cells for energy.

Circulatory SystemA delivery system

2 Functions

1. Blood delivers nutrients (food) and oxygen to cells so they can function.

2. Blood removes waste products, like carbon dioxide, from cells.

Respiratory SystemExchanges air

1 Function

http://www.goldiesroom.org/Note%20Packets/13%20Human%20Other/00%20Human%20Other%20Systems--WHOLE.htm

– Supplies body with fresh oxygen (needed by cells) and removes carbon dioxide (waste product)

Both circulatory and respiratory systems work closely together

Excretory System

Any system that eliminates wastes

Included in excretory system are:

• Digestive-water and undigested food out

• Respiratory- carbon dioxide and water out

• Skin-sweat and salts out

• Urinary-water, metabolic wastes and salts out

Urinary System: Function

• It filters your blood and removes wastes produced by your cells

• Fluid levels in the body are also maintained by the urinary system

Nervous SystemA control system

Function

• Allows your body to react to your environment and stimuli.

Endocrine System

A control system for your body

Functions

• Uses chemicals (hormones) to:a. Regulate internal environment

Functions

b. Adapt to stressful situations

Functions

c. Promote growth and development

Functionsd. Coordinate circulation, digestion, and

absorption of food.