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It includes loose connective tissue and elastin. The main cell types are fibroblasts, macrophages and adipocytes (the subcutaneous tissue contains 50% of body fat). Fat functions as padding and insulation for the body. Microbes like Staphylococcus epidermidis colonize the skin surface. The density of skin flora depends upon area of the skin.
Detailed random sample [modify] Skin layers, of both the hairy and hairless skin Structure in fish, amphibians, birds, and reptiles [modify] The epidermis of fish and of many amphibians consists entirely of live cells, with only very little amounts of keratin in the cells of the shallow layer. Related Source Here is usually permeable, and in the case of lots of amphibians, might actually be a significant respiratory organ.
Instead, in many species, it is mostly changed by strong, protective bony scales. Apart from some particularly big dermal bones that form parts of the skull, these scales are lost in tetrapods, although numerous reptiles do have scales of a different kind, as do pangolins. Cartilaginous fish have various tooth-like denticles ingrained in their skin, in place of true scales.
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Fish usually have a numerous individual mucus-secreting skin cells that aid in insulation and security, but may likewise have poison glands, photophores, or cells that produce a more watery, serous fluid. In amphibians, the mucus cells are gathered together to form sac-like glands. Most living amphibians also possess granular glands in the skin, that secrete annoying or hazardous substances.
Rather, the color of the skin is mostly due to chromatophores in the dermis, which, in addition to melanin, might include guanine or carotenoid pigments. Many types, such as chameleons and flounders might have the ability to change the color of their skin by changing the relative size of their chromatophores.
Both of these glands become part of the integument and therefore thought about cutaneous. Mucous and granular glands are both divided into three various areas which all link to structure the gland as a whole. The three specific parts of the gland are the duct, the intercalary area, and last but not least the alveolar gland (sac).
