Lab 1 human development and anatomy.docx

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University of Toronto Scarborough
Biological Sciences
Connie Boudens

Simple Squamous Epithelium Identification: Small, flat cells arranged around large, empty circles (air sacs). May be confused with Adipose Tissue, but note the multiple cells and nuclei (arrows). Features to Know: nuclei. Where Located: lung (air sacs or alveoli) and lining blood vessels . Function: diffusion (gas exchange). The top image is what you would see with a transverse section through the tissues. The bottom image is from a cheek smear and shows a cluster of four cells viewed if they were laid out flat. Simple Cuboidal Epithelium Identification: Squarish cells with round nuclei in a single row (arrows), usually arranged in a circle (tubule). Features to Know: nuclei. Where Located: kidney tubules (can also be seen in sweat glands of skin slide). Function: absorption and secretion. Simple Columnar Epithelium Identification: Tall rectangular cells, with single, neat row of oval nuclei, usually more towards the base (in the bracketed row, the base is towards the top), leaving an apical region of nucleus-free cytoplasm. Note also goblet cells, found only here and in Pseudostratified Columnar Epithelium. Features to Know: goblet cells (1), nuclei (2), microvilli (3). Where Located: jejunum of small intestine. Function: absorption and secretion. Pseudostratified Columnar Epithelium
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