What are some key points for integumentary?

The integumentary system consists of the skin, hair, nails, and associated glands, serving as the body's first line of defense against environmental hazards. Key functions include protection against pathogens, regulation of body temperature, and sensation through nerve endings. The skin also plays a critical role in vitamin D synthesis and helps maintain hydration levels. Additionally, it acts as a barrier to prevent water loss, contributing to overall homeostasis.