Keratinocytes: A. produce skin pigments in cell organelles called melanosomes. B. are found in both the dermal and epidermal layers of the skin. C. are special cells of the immune system. D. are responsible for the permeability characteristics of the epidermis. Answer D Fingerprints are produced by projections into the dermis called: A. striae. B. cleavage lines. C.
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Integumentary System Study Guide 1. Which portion of the epidermis has actively reproducing cells? Stratum Basale 2. Are keratin levels higher in superficial or deep epidermis? Superficial 3. Blood vessels and nerves are present in which layer of skin? Dermis 4. In what layer of skin can you find melanocytes? Epidermis (stratum basale) 5. What structure pulls the hair follicle into an upright position? Arrector Pili 6. What structure is responsible for whorled ridges on epidermal surfaces? Dermal
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The epidermis is made of stratified keratinised squamous epithelium which offers a waterproof defence for the skin. The epidermis has several layers within it and provides the most protection from external elements‚ and is also the site of skin cell production as the top cells are constantly rubbed off and replaced. The dermis is the second layer of the skin and is tough and elastic due to the collagen and elastin fibres it contains. The subcutaneous tissue is the layer beneath the epidermis and
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to 105; b. Answer the questions Review Your Knowledge located in page 104 - 105 in your textbook. Matching: Skin Epidermis: Thin outer layer of the skin Dermis: Layer that sits on the hypodermis and supports the epidermis Keratin: A protein that flattens‚ hardens‚ and makes the skin water resistant Subcutaneous Layer: A layer of insulation Epidermis: Contains the stratum germinativum and stratum corneum Matching: Glands Sebaceous: Oil glands; Glands that secrete vernix caseosa
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collected throat culture on Blood Agar Plates‚ that it would show a mixture of alpha‚ beta‚ and gamma hemolysis‚ was based on the results of the class control samples of S. pneumonia‚ S. aureas and S. epidermis. In these controls S. pneumonia shows alpha and beta hemolysis while S. aureas and S. epidermis showed beta and gamma hemolysis respectively. This hypothesis was based on the thought that the upper airway of most people would have at least a small mixture of all three of these bacteria as well
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“Investigate the effect of a factor on the number of stomata of a leaf.” Research Question: How do differing leaf heights affect the number/density of stomata of a leaf? Hypothesis Stomata are pores‚ typically found under the leaf (lower epidermis)‚ that control the gas exchange of transpiration‚ where water vapor leaves the plants‚ and carbon dioxide enters. I predict that the stomatal density on high leafs is higher than on low leafs. During photosynthesis the chloroplasts in the leaf
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houses sensory receptors‚ synthesizes chemicals‚ and excretes wastes. It is composed of an epidermis and a dermis separated by a basement membrane. A subcutaneous layer‚ not part of the skin‚ lies beneath the dermis. The subcutaneous layer is composed of areolar tissue and adipose tissue that helps conserve body heat. This layer contains blood vessels that supply the skin. * Epidermis * The epidermis is stratified squamous epithelium that lacks blood vessels. * The deepest layer‚ called
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a layer of epithelial tissue also known as the epidermis which under it is the connective tissues also known as the dermis and below it is the subcutaneous layer also referred to as the hypodermis or subcutis. The epidermis which is the outmost layer of the skin is made up of squamous cells. It is characterized by two distinct types the thick and thin skin. The dermis on the other hand is the thickest layer of the skin that is beneath the epidermis and helps insulate the body and cushion the internal
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(Seeleys‚ 2016). The skin also allows our body to produce excretion. The most common type of excretion is sweating to cool the body down. Our skin also plays a huge part in touch‚ pressure‚ vibration‚ temperature‚ and pain. The Merkel disk in the epidermis connects to nerve cells in the dermis to detect shapes and textures of an object contacting the skin (Integumentary System). The integumentary system works with the digestive system‚ and closely with the circulatory system as well. The skin also
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Compare and Contrast Sommia Khan Dr. Doumen Exocrine versus Endocrine glands: The similarities between exocrine and endocrine glands are that they are both glandular tissues. Glandular tissues are generally composed of cuboidal cell or columnar cell. Exocrine glands release substances like sweat and saliva through ducts on to the surface of the body. Exocrine glands include merocrine sweat glands‚ apocrine sweat glands and holocrine glands. Merocrine sweat glands‚ also known as eccrine sweat glands
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