PDF Notes: Human Physiology Functions of the skin by Mrs Okoli

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    What is the primary function of the skin?

    Acts as a barrier against external threats.

    How does the epidermis protect the body?

    It withstands wear and tear from the environment.

    What role does the dermis play in skin function?

    Supplies blood and contains nerve endings.

    What are mechanoreceptors responsible for?

    Detecting physical stimuli like touch and pressure.

    How do tactile epithelial cells function?

    They detect texture and sustained touch.

    What distinguishes Meissner corpuscles from other receptors?

    They are sensitive to light touch.

    What do Pacinian corpuscles detect?

    Pressure and vibration.

    What is the function of Ruffini corpuscles?

    They sense skin stretch.

    What do cold thermoreceptors respond to?

    Temperature changes between 25 to 30°C.

    How does the skin regulate body temperature in heat?

    Sweat production cools the body through evaporation.

    What happens to blood vessels when body temperature drops?

    They constrict to conserve heat.

    What is the role of arrector pili muscles in cold conditions?

    They cause hair to stand upright for insulation.

    How is vitamin D synthesized in the skin?

    7-dehydrocholesterol converts to vitamin D3 with UV light.

    What is the skin's role in immunity?

    Acts as a barrier and contains immune cells.