Covering and Protecting the Body The Integumentary System

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Presentation transcript:

Covering and Protecting the Body The Integumentary System Science 7

The Skin: A Cutaneous Membrane Protects the body Body covering Maintains homeostasis Regulates body temperature Slows water loss Houses sensory receptors Excretes wastes Absorbs UV radiation

Protective Body Covering

Old Skin Cells Go through Keratinization What is keratinization?

Keratinization Definition: the hardening of older cells Keratin protein fills cytoplasm Keratin is tough and waterproof. Tough layer of dead cells

Importance of Keratinization Shields against water loss Barrier for harmful chemical Barrier for pathogens Prevents physical injury of deeper tissue and organs

Regulates Body Temperature

Sweat Glands – 2 types Eccrine Apocrine Water & Electrolytes More numerous Apocrine Water, Electrolytes, Protein & Lipids Attached to hair

Eccrine Has sweat pore Helps release body heat Activated when you are hot

Apocrine Connected to hair pore Becomes active at puberty Activated by strong emotions Excitement Fear Nervousness

Absorbs UV Radiation and Gives Skin its Color

How Do We Get Our Skin Color?

Epidermis Contains Melanocytes Produce melanin Located in the deep epidermis Melanin absorbs UV Radiation

Freckles Localized concentrations of melanin

Skin Color Largely due to melanin Different Amount of melanin Size of pigment granules Additional factors: Sunlight X-ray exposure Oxygen levels in blood vessels (pink / blue)