body. It is an organ just like the heart‚ lung and liver. It provides layer of protection and plays a vital role in maintaining body temperature and by making you aware of external stimuli through the sense of touch. The skin has two layers‚ the epidermis and the dermis‚ although not part of the skin‚ the hypodermis lies beneath the dermis. When the skin is about to be damaged it shows signs of redness and warmth on the area. Skin gives protection against biological invasion‚ physical damage and ultra
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from the outside in‚ smoothing and polishing until you look perfect from head to toe. Why Sugar Scrubs Work The outer layer of your skin‚ the epidermis‚ looks a lot like a flaky pastry under a microscope. Those little flakes aren’t very appetizing‚ though; they’re dead skin cells‚ and your body naturally sheds millions of them a day. However‚ your epidermis sometimes gets a little backed up‚ and layers of skin cells refuse to flake away when your body is done with them. That’s when you need to exfoliate
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which there is a loss of pigment from areas of skin. That then results in irregular white patches of skin. Vitiligo occurs when the melanin forming cells‚ also called melanocytes fail to produce melanin. Melanin is the dark pigment that is in the epidermis that gives us our skin color. When the melanocytes fail to produce melanin‚ white patches of skin appear on the skin. Although we know how it occurs‚ we do not know why it does. There are many theories of why vitiligo does happen. These include immune
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The Hair Follicle Stem Cell Niche and the Function of the Rac1 protein within the niche. Abstract: An adult stem cell’s niche is responsible for the preservation of the stem cell’s undifferentiated state through either intrinsic or extrinsic expression of specific proteins (Scadden‚ 2006). Situated in the bulge of the hair follicle‚ hair follicle stem cells (HFSC) are quiescent in nature and are responsible for not only its self renewal but also in the production of rapidly proliferating cells
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Name: Problem: How do solutions of various salt concentrations influence osmosis in relation to an onion cell? Materials: (per student group): red onion epidermis forceps‚ dropper distilled water NaCl solution paper towels microscope slide cover slip Procedure 1. Make a wet mount of the red onion epidermis. 2. Examine under low power. When you have a clear view of several cells‚ switch to high power. Make a labeled drawing (cell wall‚ membrane‚ cytosol) of your
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future holds. I imagine myself happy as to what I have accomplished in my life and excited to watch my family grow up. First of all‚ I hypothesize that my physical attributes such as my eye color‚ hair‚ and skin/epidermis will lose their youthful touch. This is because my skin/epidermis will lose its elasticity and its oil. As for my hair and eye color‚ the color will fade for both subjects. Although these physical attributes fade and lose their youth-like simplicity‚ my memory will be sharp. All
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INTRODUCTION The enzyme catalase converts hydrogen peroxide (H2O2) to water and O2. The evolution of O2 causes bubbling. Thus‚ catalase-positive organisms that are mixed into hydrogen peroxide will cause bubbling (catalase-negative organisms will not). This test is good for distinguishing between Gram-positive cocci in chains (catalase negative) versus Gram-positive cocci in clusters (catalase positive). The coagulase test is used to differentiate Staphylococcus aureus from coagulase-negative
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Burn injury is among the most weakening traumas to humans. The rate of burns in the United States of America is estimated to be over 2 million cases per year‚ with 3‚400 deaths per year and about 250000 people are burnt each year in the United Kingdom. Of these‚ almost 112000 attend an accident and emergency department and about 210 die of their injuries. According to the World Health Organization‚ it is estimated that about 300‚000 dies worldwide each year due to burns. Burn injury causes
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In this presentation I plan to discuss a little about each of these cases as well as tell ways to prevent and treat them. The first most common skin cancer is basal cell carcinoma. This cancer develops in the basal or bottom layer of the epidermis‚ which is the top layer of the skin. The cause of this cancer is a gene called patched or PTC‚ which helps to control cell growth and development. If this gene is missing‚ defective‚ or damaged by ultra violet radiation‚ unrestrained cell proliferation
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segments also changed. Differences in tagmatisation helps to separate the major classes in phylum arthropoda 2. Jointed appendages a. Modified for specialized functions (sensory‚ food handling‚ swift movement) 3. Hard exoskeleton a. Secreted by epidermis b. Made of chitin and protein c. Flexible & allow muscle attachment d. Prevent water loss (desiccation) & protect from predators 4. Early arthropods show little variation from segment to segment. 5. Cephalothorax= head + thorax‚ abdomen 6.
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