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The human body is made up of approximately 60 trillion cells that work together to keep us alive and functioning properly. These cells are constantly working to repair and replace old and damaged tissues throughout our bodies. The human brain, for example, contains an estimated 100 billion neurons that communicate with each other through electrical and chemical signals. The circulatory system, which includes the heart, blood vessels, and blood, plays a vital role in delivering oxygen and nutrients to cells and removing waste products from them. The digestive system, on the other hand, is responsible for breaking down food into smaller molecules that can be absorbed by the body. The immune system protects us against infection and disease by detecting and destroying pathogens such as bacteria, viruses, and fungi. The nervous system transmits signals between different parts of the body and enables us to move, feel sensations, and think.