BIOB33H3 Lecture Notes - Lecture 2: Thermoception, Dimethyl Sulfoxide, Subcutaneous Tissue

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22 Oct 2018
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The integumentary system (based on chapters 2 and 4) The integumentary system is composed of: skin, hair, nails. Integumentary structure and function: skin (cutaneous membrane) is made of two divisions, epidermis most superficial, dermis deep to epidermis, hypodermis (subcutaneous layer) is deep to the dermis, accessory structures - hair, nails, exocrine glands. Immune defense phagocytic cells against pathogens and epidermal cancer cells epidermal dendritic (langerhans) cells. The epidermis: region that deals with friction (1-2 dimes thick), thickest on soles of feet and thinnest behind ears and eyelids. Like a deck of cards, each card is flexible, but the entire deck is tough and hard to tear: epidermis is derived from ectoderm germinal layer (next lecture, bottom/basal (deepest) layer is most important. A small amount of uv is necessary because the skin requires it to convert a cholesterol-related steroid precursor into vitamin d hormones.

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