Presentation on theme: "Human Anatomy The Integument System. Function(s) 1. Physical protection 2. Temperature Regulation 3. Protects against water loss 4. Excretion 5. Synthesis."— Presentation transcript:
Older cells harden in a process called keritinization. (Keratin is waterproof). Protects the underlying tissues from UV light, chemicals, injury, and microorganisms. Melanocytes produce melanin. Melanin absorbs UV light.
Skin Color Is determined by 3 pigments 1. Hemoglobin – red pigment within rbc 2. Melanin – brown pigment in melanocytes 3. Carotene – orange-yellow pigment found in both epidermal cells and dermal fat cells
Dermis contains... Elastic and fibrous connective tissue Blood vessels integrated within to help regulate body temperature Nerve tissue carries sensory impulese Hair follicles Sebaceous Glands (oil) Sweat glands
Sebaceous Glands Attached to hair follicles (usually) Secrete oil which helps keep hair soft & waterproof Acne is a bacterial infection of the sebaceous gland
Sweat Glands Most numerous in palms & soles Sweat is mostly water, but also salts and urea and uric acid. Some are specialized such as the ones in the ear (ear wax) Response to heat or emotional stress
Regulation of Body Temperature 37°C or 98.6°F Heat Lost = Heat Produced Thermometer is called the hypothalamus (in the brain) Internal regulation is called homeostasis (biological balance) Sweating, shivering, flushing, are examples of temperature regulation
Healing We will talk more about immune response later on..... Blood vessels can swell causing fluids to leak into a wound (inflammation) Scabs are a result of blood clots at the dermal layer Scars result from larger wounds where new blood vessels had to be formed