JP Freestyle PRO 2017

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The human body is a complex and highly organized system that consists of trillions of cells working together to maintain homeostasis and function properly. The human brain, which weighs approximately 1.4 kilograms, controls all bodily functions, including movement, sensation, perception, and cognition. It contains billions of neurons that communicate with each other through electrical and chemical signals. Human muscles make up about 40% of the body's total weight and are responsible for movement, support, and stability. They contract and relax in response to nerve impulses from the brain. The human heart pumps blood throughout the body, supplying oxygen and nutrients to tissues and organs. It beats approximately 3 billion times in a person's lifetime, pumping over 1 million barrels of blood. Human lungs are responsible for exchanging oxygen and carbon dioxide through the process of respiration. They take in oxygen from the air we breathe and expel carbon dioxide as a waste product. The human digestive system is a complex process that involves the breakdown of food into nutrients that can be absorbed and utilized by the body. It includes the mouth, esophagus, stomach, small intestine, and large intestine. Human skin is the largest organ in the body and plays a crucial role in regulating body temperature, protecting against external damage, and aiding in the production of vitamin D.