Epithelial tissue that lines the air pockets (alveoli) of the lungs.
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This tissue lines the tubules of the kidney. You can see the lumen (open area) and the single layer of cuboidal cells that enclose a tubule. The cells are cuboidal in shape with the nucleus in the center.
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This tissue lines the digestive tract. The light fuzz on the apical surface of the cells are microvilli that increase the absorptive area of the cell. The light purple structures are goblet cells, which are unicellular glands that secrete mucous.
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The identification is from the shape of the top layer of cells.
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This tissue is characterized by oval plasma cells and 3 different kinds of fibers: collagen (thick and light pink), elastic (thinner and dark), and reticular (thinnest and dark).
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There are two osteons in this micrograph. The dark and light ovals are the central canals or Haversian canals through which blood vessels and nerves project. Surrounding central canals are the lamellae with the osteocytes embedded in the solid calcium and phosphate matrix. The fine lines radiating out from the center are canaliculi.
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Lacunae (small openings) contain the chondrocytes, which are embedded in a smooth matrix. Chondroblasts, which secrete the matrix, can be seen at the top of the micrograph.
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Most of the cell volume is taken up by a triglyceride droplet. On some of the cells you can see the nucleus pushed up against the plasma membrane.
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This micrograph of a human blood smear shows red blood cells (erythrocytes), white blood cells (leukocytes), and platelets
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Skeletal muscle cells are cylindrical in shape. They are multinucleate and striated. The nuclei are found against the plasma membrane.
You should be able to see the striations on the larger image or on this micrograph.
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Cardiac muscle cells are also striated but unlike skeletal muscle, they have a single nucleus and are branched. The cardiac muscle cells are attached to each other through desmisomes. The desmisomes and gap junctions together make up the intercalated discs, which are the dark blue lines that run perpendicular to the muscle fiber.
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Smooth muscle has a spindle shape and a single nucleus. It is NOT striated.
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The large central structure is a motor neuron surrounded by the small dark nuclei of the glial cells that are important in maintaining the tissue environment. The motor neuron is multipolar and exhibits an axon and dendrites extending from the body of the cell.
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