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This is the system that contains the heart and the blood vessels and moves blood throughout the body it helps tissues get enough oxygen and nutrients and it helps them get rid of waste products.
It is the network of organs and tissues that help you breath it includes airways,lungs and blood vessels and muscles that power your lungs are also part of the respiratory system.
The muscular system is composed of specialized cells called muscle fibers the predominant function is contractbility. Muscles attached to bones or internal organs and blood vessels are responsible for movement.
The digestive system includes the mouth,throat,esophagus,stomach,small intestine,large intestine,rectum and anus it also includes the salivary glands,liver,gallbladder and pancreas which make digestive juices and enzymes that help the body digest food and liquids.
The nervous system has two main parts the central nervous system is made up of the brain and spinal cord. The peripheral nervous system is made up of nerves that branch off from the spinal cord and extend to all parts of the the body.