Human Body Systems

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Human Body Systems
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Levels of Organization

• 1- cells
• 2- tissues
• 3- organs
• 4- organ systems
• 5- organism

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Each system works together to help us function
and survive
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Skeletal System
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Skeletal System

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

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5 Functions of the skeletal system

• 1. Gives shape and support to your body

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• 2. Protects your internal organs

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• 3. Muscles attached to your bones help you move

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

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• 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

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Muscular System
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Over 600 muscles make movement possible
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2 Functions of the Muscular System

• 1. Helps your body move

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

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Integumentary System

• Our largest system, made up of one organ
• Skin

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4 Functions

• Protection

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• 2. Sensory Response

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• 3. Vitamin D formation

http//www.nature.com/news/skeletons-show-rickets-
struck-the-medici-family-1.13156
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• 4. Maintain body temperature- using blood vessels
  constricting and sweating

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Digestive SystemHelps provide energy for our body
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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.

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Circulatory SystemA delivery system
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2 Functions

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

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

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Respiratory SystemExchanges air
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1 Function

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

http//www.goldiesroom.org/Note20Packets/1320Hum
an20Other/0020Human20Other20Systems--WHOLE.htm

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Both circulatory and respiratory systems work
closely together
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Excretory System

• Any system that eliminates wastes

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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

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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

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Nervous SystemA control system
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Function

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

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Endocrine System

• A control system for your body

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Functions

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

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Functions

• b. Adapt to stressful situations

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Functions

• c. Promote growth and development

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Functions

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