BIOL126 Lecture Notes - Lecture 7: Nociceptor, Dendritic Cell, Adrenocorticotropic Hormone
Document Summary
Integumentary system; skin as a sense organ and thermoregulation, major cells of the integument; their locations, roles and functions. The physical barrier formed by the surface (stratum corneum layer) Mechanical strength of the tissues that form the skin. Melanin: dark-coloured light sensitive pigment which protects against excessive uv. Keratin: role in wound healing: sensation: skin sense receptors. Nocioceptors (cid:894)do(cid:374)(cid:859)t show adaptatio(cid:374)(cid:895): respo(cid:374)d to e(cid:454)tre(cid:373)es of te(cid:373)p, ph(cid:455)sical da(cid:373)age of cells, i(cid:374)fectio(cid:374). Thermoreceptors (very active while temperature changing, but adapt quickly): free nerve endings that detect hot/cold. Mechanoreceptors: sensitive to stimuli which distort cell membranes: temperature regulation: e. g. retention or release of body heat depending on environment temp. Sweat gland activation, followed by evaporation of sweat from the skins surface. Dilation/ constriction of blood vessels: excretion of salts and water by sweat glands; and oils for lubrication and small amounts of organic wastes by sebaceous glands.
