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ISU BSC 181 - Dermis, Skin Markings, Skin Color

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BSC 181 1st Edition Lecture 12Outline of Last Lecture I. Cells of the EpidermisII. Layers of the Epidermis Outline of Current Lecture III. DermisIV.Skin MarkingsV. Skin ColorCurrent LectureDermi s: this is one of the layers of our tissues. The dermis is connective tissue, it is strong and flexible. It has macrophages, fibroblasts, and sometimes white blood cell in it. The dermis has two sublayers. Papillary: (papilla: means a projection) something that is protruding or sticking up. This is mainly areolar connective tissue and it is a loose tissue. The cells found in it are phagocytes. Phagocytes are like guards of the body, they look for anything out of place. Dermal Papillae: provides an adhesion so the epidermis and the dermis do not slip and slide across each other. It also contains touch and pain receptors.Reticular: which we already know from learning the connective tissue, is a network of branching pathways throughout the body. This is very dense connective tissue, and it contains elastic fibers that allows it to stretch, as well as collagen fibers to give it strengthand bind water.Skin MarkingsFlexure Lines: these are folds in your skin, it is where your dermis is tightly bound to deeper structures. It can be found on the palms of your hand and feet, as well as other places. Striae: these are stretch marks (which can turn a grey slivery color) and scarsBlister: you get blisters (separate the epidermis and dermis layers) when you touch something hot and it burns your skin (a small, short lived trauma)These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.Skin Color: Melanin: (dark brown/black) this is the only pigment made in the skin, this pigment we already summarized in a previous lecture. Tanning is because when we are exposed to more sun, our body produces more melanin which is brown/black. Tanning is normal, butwhen you start to see sun spots which are white in color, that is a fungal infection.Carotene: (orangish yellow) you can see this the best in the palms of your hands and yourtoes. If you lose blood to that area, the skin will turn an orangish yellow. When the blood comes back, the skin will return to the pinkish glow characteristic when there is hemoglobin present. Hemoglobin: (pinkish look to skin because of blood mixing with oxygen) a “fair skin”


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ISU BSC 181 - Dermis, Skin Markings, Skin Color

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