Integumentary System

• Integumentary System - It serves to protect the body from external damage, regulate body temperature, and help with sensory perception.
• Three layers of the skin

  • Epidermis: outermost layer and composed of keratinocytes.
  • Dermis: second layer composed of collagen, glands, and elastic fibers.
  • Hypodermis: the subcutaneous layer that contains fat and connective tissues.

  
• Hair - is composed of keratin and grows from hair follicles located in the dermis.
• Nails - are composed of keratin and grow from nail beds located in the epidermis.
• Sweat glands - produce sweat, which helps regulate body temperature and eliminate waste products.
• Oil glands - produce sebum, which helps keep the skin and hair moisturized.
• Mammary glands - produce milk in females.