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Organs would be considered open systems. This is because they exchange heat with their surroundings, as well as matter. All our organs are constantly taking up and expelling molecules, as well as heat energy, to maintain homeostasis.
The human body is an open system because an open system refers to both energy and matter getting in and out of the system. Various inputs such as food, oxygen and water go in whereas wastes and carbon dioxide go out. Energy can be transmitted in and out of the body such as when throwing a ball. The kinetic energy is transferred from a person's hand to the ball.
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