PHAR1821 Lecture Notes - Lecture 18: First Aid, Hair Loss, Melanocyte
Document Summary
Flexible layer that protects what"s in: protection from water, air, pathogens. Large volume of presentations to pharmacists (20%) and gps (15%) (marks et al 1999) Keratinocytes formed constantly & migrate to surface (4 weeks) then shed (i. e. , dust in your house) Connective tissue collagen (strength) & elastin (flexibility) protein network (extracellular matrix) Sebaceous glands, sweat glands: are the two things that change with aging, as you get older, the number of fat cells & collagen fibres decrease. Primary role protection: but it has sensory role as well; movement of the hair and the muscle in the hair also provides sensory nervous stimuli imp for our protection role. Sebum producing hair follicle to protect & strengthen the hair shaft from damage: excess sebum/under-producing sebum => can cause dysfunction within skin. Attached to the arrector pili smooth muscle. Found in large numbers in face, upper back, and chest. Become large & active during the hormonal.
