the body and its cells are continuously replaced as they are lost to normal wear and tear. The skin has between 12 to 20 square feet in area and accounts for 12% of body weight. It is composed of 3 layers the epidermis‚ the dermis‚ and the sub cutis. The thickness of the epidermis and the dermis varies over different parts of the body. It is thicker on the palms of our hands and feet‚ and thinner on our eyelids which have to be light or our eyes would always be closed. The dermis‚ or known
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cluster of chromatids and the spindle fibers disintegrate. Integument: The four layers of the epidermis from the deepest layer to the most superficial layer is stratum basale‚ stratum spinosum‚ stratus granulosum‚ stratum corneum. Even though the sebacious glands and sudoriferous glands have ducts that open onto the skin surface or a hair follicle‚ the actual glands are located in the dermis. The epidermis is composed of a keratinized stratified squamous epithelium. Just like other epithelia‚ it is
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INTEGUMENTS Protozoa- delicate cell membrane (Amoeba) Coelenterata- epidermis‚ single layer of cells (e.g. corals and Hydra) Annelida- epidermis contains non-cellular cuticle (e.g. earthworm) Platyhelminthes- epidermis contain contains resistant cuticle (e.g. liver fluke and tape worm.) Arthropoda- chitin (e.g. shrimp‚ crabs‚ lobster and insects) Mollusca- shell (clams‚ mussels and oysters) VERTEBRATE INTEGUMENTS I. EPIDERMIS - outer‚ thinner but stratified layer of the skin - Ectodermal
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it usually takes several years before this damage leads to health problems such as melanoma (1). The skin is made up of three layers which are the epidermis‚ the outer layer of skin‚ the dermis‚ which is the middle layer of skin‚ and the hypodermis‚ which is the deeper layer of skin which is also made up of fat. Melanocytes are located in the epidermis and produce pigment. Melanoma forms a tumor when melanocytes change and grow rapidly (8). It
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appropriate medium with L. acidophilus and S. epidemidis using aseptic techniques. Refer to pages 91-93 of the lab manual for step-by-step instructions. The MRS broth will be inoculated with L. acidophilus and the nutrient broth will be inoculated with S. epidermis. The final step is to observe the microbial growth and record observations. Check the samples in the incubator at 24 hours. If you do
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Stomata are tiny pores found on the epidermis of the leaf‚ surrounded by guard cells. [1] Their main function is gas exchange [1] for photosynthesis and respiration. The development of stomata on the leaves of a plant is determined by interaction between different genes and environmental factors. A few studies have been conducted in order to establish a relationship between stomatal densities and given environmental factors. Research has shown that stomatal densities are controlled by environmental
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With nearly 3‚800 species‚ lizards are a widespread group of squamate reptiles. Some of these creatures are capable of autotomy‚ which allows them to detach their tail and later regenerate a new one. This is most commonly used as a predator defense mechanism. The African house gecko‚ Hemidactylus Mabouia‚ is one of the limited species of reptiles that are able to reproduce a lost limb. Autotomy and tail regeneration can be broken down to several steps‚ from the severing of the old tail to the three
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Photosynthesis in C3 plants and their adaptations to the Mediterranean Climate Abstract. Photosynthesis is the process that plants use to harness the energy of the sun through light and use it to create sugars. Photophosphorylation is the first step of photosynthesis and occurs in the chloroplast. Light is captured by light harvesting complexes. The light excites electrons which excite surronding electrons through resonance induction and excite special pairs of electrons. These electrons help pump
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several important functions. Thickness of the skin will vary depending on the location on the body e.g. the skin on the face is thin‚ skin on the back is thick. There are two main layers of the skin‚ the epidermis and the dermis‚ these two layers of skin lye on a third layer called the subcutis. The epidermis is a thin outer layer of skin containing no blood vessels and relying on the dermis for its nutrients. The dermis is the second layer of skin‚ this is the thickest of all three layers of skin‚ the
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and mesenchymal cell divisions replace lost dermal cells. The regeneration of the skin after an injury involves four stages. Step 1 is when damage extends through the epidermis and into the dermis‚ bleeding generally occurs. Step 2 is when the blood clot/scab forms at the surface temporarily restores the integrity of the epidermis and restricts entry of additional microorganisms into the area. Step 3 if when fibroblast activity leads to the appearance of collagen fibers and typical ground substance
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