The Circulatory System transports materials throughout the entire body. It is important because we need the materials being circulated throughout the body.
The respiratory system is involved in the intake and exchange of oxygen and carbon dioxide between an organism and the environment. This is important because we need oxygen to breath.
The digestive system is when we digest food and produce nutrients. This is important because we need nutrients to live.
The integumentary system is the organ system that protects the body from various kinds of damage. This is important because it protects our body from harm.
The excretory system is the system of an organism's body that performs the function of excretion, the bodily process of letting out wastes. This is important because it its important to get waste out the body and kinds of works with the digestive system.
The nervous system is when your nerves sends signals to your brain. This is important because the nerves in our body tell our brain how to react to it and we wouldn't know how to react to it without the system.
The urinary system is how you release the liquid waste. This is important because we need to get the liquid wastes out of our body and we can't hold in pee.
The skeletal system is the framework for the body. This is important because we need bones in our body to hold our self's up we cant just walk around with no bones.
The muscular system permits movement of the body, maintains posture, and circulates blood throughout the body. This is important because we wouldn't be able to move without muscles.
The endocrine system is the collection of glands. Its important because it secretes particular chemical substances for use in the body.
The immune system is the body's defense against infectious organisms and other invaders. This is important because it fights off our sickness's and make us use to it so it want harm us.