Integumentary System Overview

Components of the Integumentary System

• Skin: Largest organ by weight (~21 pounds)
• Appendages: Include nails, hair, and sweat glands

Functions of the Skin

Impermeability

• Skin acts as a barrier to water and other molecules (e.g., viruses)
• Prevents harmful substances from entering the body

Immunological Function

• Secretion of Antibodies and Enzymes:
  • Antibodies and enzymes like lysozymes protect against pathogens
• Langerhans Cells:
  • Present in the top layers of skin
  • Engulf bacteria to prevent infections

Sensation

• Skin perceives environmental stimuli:
  • Pain
  • Temperature (hot or cold)
  • Touch and texture discrimination

Thermoregulation

• Sweating: Aids in cooling through evaporative cooling
• Blood Vessels: Help conduct heat away from the body

Conclusion

• The skin is more than just a physical barrier; it plays multiple roles in maintaining homeostasis and protecting the body.
• Future videos will explore detailed mechanisms behind these functions.