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Human Biology - Essay Example

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The principle behind this optical illumination is to allow light to illuminate dense areas of samples, providing contrasting effect making them…
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Download file to see previous pages Fixation therefore preserves protoplasm, prevents autolytic changes and bacterial growth (Pawley, 2006, p. 370). After this, tissue sample should undergo dehydration, clearing and embedding. These processes ensure tissue sample is dehydrated or cleared from fixated agents and solidified to provide strong support to tissue blocks to make cutting in thin sections possible (Pawley, 2006, p.370).
In bright field light microscopy staining for routine histological examination of tissue sections enhances natural contrast making tissues or cells more visible. Haematoxylin reacts with basophilic components of cells producing bluish tint to dark blue stain, Eosin stains pinkish colour to pink of acidophilic components of cells (Bancroft and Gamble, 2008, p.126).
This is a cardiac muscle tissue. Its fibers are joined by intercalated discs, thick plasma membranes, shown as horizontal lines in the picture (DuPree and DuPree, 2007, p.53). The single central nucleus is also visible.
This is a central nervous system, particularly a spinal cord formed by nervous tissue. Neurons and neuroglia are remarkable in this image showing the interconnecting cells and their supports (Chiras, 2011, p.78).
This is a neuron which contains nucleus in its cell body that is responsible for synthesizing proteins and membranes while the axon conducts electrical impulse while the dendrites collect information (Hollenbeck and Bamburg, 2003).
Satellite cells are situated in dorsal root ganglia somewhere in either side of the spinal cord and they enclosed cell bodies containing sensory neurons that are found inside the ganglia (Tiidus, 2008, p.77).
Ordinary staining technique could not enhance visibility of the collagen fibres of hyaline cartilage (Amitrano and Tortora, 2012, p.65). Protoplasm and nuclei under intranuclear network are found in this specimen.
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