The key difference between excretion and secretion in the skin lies in the purpose of the released substance. Excretion involves the removal of waste products from the body, while secretion involves the release of substances that serve a specific function.
Excretion:
- Purpose: Removal of waste products.
- Example: Sweat glands in the skin release sweat, which contains metabolic byproducts like urea and salts. Sweat helps to regulate body temperature and remove waste products.
- Skin Structures involved: Sweat glands.
Secretion:
- Purpose: Release of substances with specific functions.
- Example: Sebaceous glands in the skin secrete sebum, an oily substance that lubricates and protects the skin.
- Skin Structures involved: Sebaceous glands.
Therefore, excretion by the skin eliminates waste products, while secretion produces substances that contribute to skin health and function.
