Companion Cube Jim (Belongs to my teacher)

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The human body is a complex system that is controlled by the brain and nervous system. It has many different parts that work together to keep it alive and functioning properly. These parts include organs, tissues, and cells that perform various functions such as digestion, circulation, respiration, and excretion. The brain, which is the control center of the body, sends signals to the muscles through nerve impulses. This allows the muscles to move and function properly. The nervous system also includes the spinal cord and nerves that transmit information between the brain and other parts of the body. The circulatory system is responsible for transporting blood throughout the body. It consists of the heart, arteries, veins, and capillaries. The heart pumps blood through the arteries, which are then carried to the capillaries where oxygen and nutrients are exchanged with the cells. The veins return the deoxygenated blood back to the heart. The digestive system is responsible for breaking down food into nutrients that can be absorbed by the body. It includes the mouth, esophagus, stomach, small intestine, and large intestine. The teeth chew the food in the mouth, and it then passes through the esophagus into the stomach where it is digested by stomach acid. The partially digested food then enters the small intestine where it is absorbed into the bloodstream. The respiratory system brings oxygen into the body and removes carbon dioxide. It includes the lungs, trachea, bronchi, and diaphragm. The diaphragm contracts and relaxes to draw air in and out of the lungs through the trachea and bronchi. The excretory system is responsible for removing waste products from the body. It includes the kidneys, ureters, bladder, and urethra. The kidneys filter the blood and remove waste products that are then carried to the bladder where they are stored until they are eliminated from the body through the urethra.