Functions of the Skin
Start with the big picture
Skin functions work together to protect the body and support homeostasis. The epidermal barrier limits injury, pathogen entry, UV exposure, chemical penetration, and water loss. Sweat evaporation and changes in cutaneous blood flow help regulate temperature, while sensory receptors detect touch, pain, and heat or cold. The skin also contributes to vitamin D synthesis, immune surveillance, excretion, absorption, blood storage, and endocrine signaling. During wound healing, keratinocytes, fibroblasts, and new blood vessels help restore tissue. Changes in skin color, texture, and appendages can also communicate physiological or emotional states. Understanding these roles provides a framework for connecting skin structure with its varied functions.
What you'll learn
- Describe how the skin’s barrier limits injury, microbial entry, UV exposure, chemical penetration, and water loss.
- Explain how sweat evaporation and cutaneous blood flow contribute to thermoregulation.
- Identify the sensory receptor types involved in cutaneous perception.
- Outline the skin’s roles in vitamin D synthesis, immunity, excretion, and absorption.
- Summarize how skin supports wound healing and nonverbal communication.
Continue your study
Work through the complete notes and reinforce the topic with the study tools available in the full lesson.
