Anatomy & Physiology

• Apocrine secretion (sweat)


  is seen in certain glands such as mammary glands (responsible for milk production) and certain sweat glands
• Holocrine secretion (oil)


  is observed in some sebaceous glands, which produce oily secretions (sebum) that lubricate the skin and hair
• 1 micrometer (μm) = 1000 nanometers.


  smallest cell/bacteria (mycoplasma) - 0.2 μm in diameter
• human cells are about 20 μm across