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The correct answer to the question "Which organ is a part of the integumentary system?" is skin.
Here's why:
1. Skin: The skin is the largest organ of the integumentary system. It serves as a protective barrier for the body, regulating temperature, preventing dehydration, and housing sensory receptors.
2. Muscles, Bones, and Tendons: While muscles, bones, and tendons are crucial parts of the musculoskeletal system responsible for movement and support, they are not part of the integumentary system.
Understanding the functions and components of the integumentary system, especially the skin, is essential for grasping how our body protects itself and maintains homeostasis. If you have any more questions or need further clarification, feel free to ask!