Anatomy and physiology of farm animals by R D Frandson; Thomas Leslie Spurgeon

By R D Frandson; Thomas Leslie Spurgeon

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Extra resources for Anatomy and physiology of farm animals

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The diaphragm divides the embryonic body cavity into a thoracic cavity and the abdominopelvic cavity. Each of these are further subdivided. The thoracic cavity contains the pericardial sac, which surrounds the heart, and two pleural sacs, which surround the two lungs. These sacs are formed by a serous membrane, the pleura, a layer of simple squamous epithelium with underlying connective tissue, moistened with the small amount of fluid within the cavity of the sac. The abdominopelvic cavity is somewhat arbitrarily divided into the abdominal and pelvic cavities.

Pericardial, pleural, and peritoneal spaces). Blood plasma, a specific type of ECF, is about 5% of total body weight. The percentages for the different types of body fluids vary from one animal to another. Factors affecting these percentages include condition (amount of fat), age, state of hydration, and species. Water is constantly lost from the body, and it must be replenished if the animal is to remain in water balance and not become dehydrated. Most is lost via the urine, but it is also lost in the feces and by evaporation from body surfaces, such as the skin and respiratory passages.

2. Embedding the tissue in a material that will permit cutting very thin sections. Paraffin is used for producing sections of 5–10 μm thickness; sections as thin as 1– 2 μm can be obtained by embedding in a plastic, such as glycol methacrylate. Since most embedding media are not water soluble, the fixed tissue must be dehydrated and then infiltrated with some material such as xylene, which is miscible with the embedding medium. Frozen tissues need not be embedded. 3. Sectioning the tissue into very thin slices so that the sections may be placed on a glass slide.

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