7 Body systems

circulatory system

• a transport system 
• made up of blood, blood vessels, and a heart
• circulates blood throughout the body
• arteries, veins, and capillaries are parts in it

skeletal system

• provides a framework the supports the body  
• helps the animal move
• protects internal organs
• produces blood cells
• contains bone and cartilage

muscular system

• allows us to move around against gravity
• contains muscles, heart, stomach, and tendons
• muscles are bundles of cells and fiber
• muscles only pull, they never push
• there are 630 muscles in your body

nervous system

• made up of your brain, spinal cord, and nerves
• controls what you do 
• nerves send impulses to your brain
• contains the PNS and CNS
• the brain and the spinal cord control all the body's motion 

digestive system

• a group of organs that break down the food animals eat
• two kinds of digestion: mechanical and chemical
• with each step, food is broken down further
• herbivores consume only plants
• carnivores eat only meat

RESPIRATORY system

• the system that helps you breathe
• the lungs and the diaphragm are in it
• oxygen is taken into the body and exchanged for CO2
• carbon dioxide is forced out
• the trachea and the bronchi help yo breathe, too

excretory system

• excrete mean to get rid of
• gets rid of wastes and toxic
• 60% of your body is made of water
• consists of the liver, the skin, and the kidney
• helps keep the salt level in your body right

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