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

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 =

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

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

Digestive System Helps 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 System A 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 System Exchanges air

1 Function 20Packets/13%20Human%20Othe r/00%20Human%20Other%20Syst ems--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 System A 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

Functions d. Coordinate circulation, digestion, and absorption of food.