Everyone’s body is made up of different systems with coordinating functions that make it so that we can grow, live and move in a normal, healthy manner. Some of these such systems include the respiratory system, the immune system, the skeletal system, the muscular system, the digestive system, the reproductive system, and the nervous system. For example, the respiratory system works to facilitate the intake of air so that the body can use oxygen to function and expel the unnecessary carbon dioxide. This system includes the mouth, nose, esophagus, lungs, and diaphragm. Another system, the muscular system, consists of parts of the body that facilitate movement, the maintenance of posture, and the circulation of blood throughout the body. This system includes the skeleton (bones), and muscles that are classified as smooth and cardiac.
The nervous system is the biological system that facilitates the activity of the body by sending and receiving signals to and from different parts of the body. This system includes the brain, spinal cord, and nerves. If you have ever been poked or pricked by a sharp object, when you feel pain, it is because of the proper functioning of your body’s nervous system. The pain that registers in your brain does so as a result of the signal transmitted from the part of your body that was damaged and possibly began to bleed. Also, if there is a part of your body that is numb or paralyzed, when it is hit, poked or damaged, there is no signal transmitted to your brain that lets you know that your body has been damaged. This is because the nerves in that area of the body are not functioning properly due to numbness or paralysis. In this situation, you would not feel any pain.