The diaphragm can be classified as part of both the respiratory system and the muscular system.
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Respiratory System: The diaphragm plays a crucial role in the process of breathing by contracting and relaxing to help draw air into the lungs and expel it out.
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Muscular System: The diaphragm is a skeletal muscle, meaning it is involved in voluntary and involuntary movements, contributing to the mechanics of breathing.
Thus, it functions in both systems, facilitating respiration while being a muscle in the muscular system.