Human anatomy

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Biological Sciences
Stephen Reid

BIOB33 Sperm-has midtail, head and tail Mitochondria in midsection Choleciferol produced by epidermal cells when exposed to UV light. Calcitrol, active form of Vit D, promotes calcium and phosphate absorption and regulation.15 minday will provide your body with its daily vit d requirement. Dermis-middle layer of skin (=integument). Composed mainly of cells of connective tissue and collagen fibers although both elastic and reticular fibers are also present Other component of dermis are blood vessels, sweat glands, sebaceous glands, hair follicles, nail roots and sensory nerve endings and smooth muscle tissue Consist of 2 layers: Papillary layer superficial, adjacent to the epidermis, composed of areolar connective tissue and its name comes from the projections of the dermis towards the epidermis dermal papillae The dermal papillae interlock with the epidermal ridges *deep projections of the epidermis ) Together the dermal papillae and the epidermal ridges increase the contact between these layers Each dermal papillae contains the capillaries that supply nutrients to the cells of the epidermis, the dermal papillae also contains the sensory receptors that continuously monitor touch on the surface of the epidermis. Reticular layer of the dermis -forms the deeper and the major portion of the dermis and extends from the thin papillary layer to the underlaying subcutaneous layer. contains dense irregular connective tissue through which bundles of collagen fibers extend in all directions. The collagen fibers are interwoven in a meshwork. these collagen fibers make it hard to make a distinct marcation of the papillary layer and the reticular layer Reticular- meshwork of collagen fibers Epidermis: Epithelium of the skin Keratinized and stratified squamous epithelium
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