GREAT ROOM STAIR-MODEL-WAIN R Es

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The human body is made up of trillions of cells that work together to keep it alive and functioning properly. The brain, which is often referred to as the control center of the body, sends signals through the nervous system to control everything from movement and sensation to emotions and thoughts. Cells are the basic building blocks of life, and they come in many different types, each with its own unique function. Red blood cells carry oxygen throughout the body, white blood cells help fight off infections, and platelets help the blood to clot when a person is injured. The nervous system is made up of two main parts: the central nervous system, which includes the brain and spinal cord, and the peripheral nervous system, which connects the central nervous system to the rest of the body. The nervous system sends signals through nerve cells, or neurons, that allow it to communicate with other parts of the body. The human eye is a complex organ made up of many different layers. It works by focusing light onto the retina at the back of the eye, where it is converted into electrical signals that are sent to the brain. The eye has many muscles that work together to move it and focus on objects.