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Embryology, cells and skin.docx - Bio 65 8/29/17...

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Bio 65 – 8/29/17Embryology, Cells, and SkinSystems --> organs --> tissue --> cellsEmbryologyTakes two weeks for cells to divide3 primary germ layers1.Ectoderm (outer): produces epidermis, brain, spinal cord*root words: ecto, meso, endo*2.Mesoderm (middle): produces bones, muscles3.Endoderm (inner)Yolk sac: source of blood cells-Appears in third week of development-Four weeks developed: heart (it is pumping), brain, retina, upper and lower limbs develop-Five weeks: liver is developed (very big)CellsCell type: simple, stratified, pseudostratified, squamous, Cuboidal cells are found in kidney (cubelike cells)Neurons: nerve cellsRed blood cells should not have a nucleusA white blood cells nucleus isn’t always roundCytoplasm: cell liquidRough endoplasmic reticulum: produces proteinsSmooth endoplasmic reticulum: produces lipids and steroidsMitochondria: produces energy of cell (ATP), the more mitochondria the more energy the cellhas

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Term
Spring
Professor
Kerr

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