BIOL 030 Lecture Notes - Lecture 8: Cyanosis, Mitosis, Stratum Corneum
16 Sep 2020
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Dimples where dermis is tightly attached to underlying deep fascia or bone. Maintenance of body fluids prevents dessication (waterproof), prevents absorption. Excretion sweat glands secrete water, ions, urea, ammonia (just like kidney) Maintenance of body temperature sweat cools body, blood vessels bring warm blood to surface to radiate heat, adipose tissue insulates. In skin: vit d precursor + uv another precursor (cholecalciferol) In liver: cholecalciferol 25 hydroxy cholecalciferol. In kidney: 25 hydroxy cholecalciferol vitamin d. Function vit d stimulates ca and po absorption in gut. Immunity contains wandering cells of immune system. Communication embarrassed, nervous, cyanosis, jaundice, age, nerve damage. Diagnostic characteristic single layer of cells sit upon basement membrane. Mitosis occurs here (constantly resupplies epidermis with new cells) Diagnostic characteristic spiny appearance, the spines are where desmosomes attach and hold adjacent cells toether into one unified sheet. Artifact gaps between cells form due to shrinkage during tissue processing.
