temperature. The skin contains secretions that can kill bacteria‚ and the pigment melanin provides a chemical defense against ultraviolet light that can damage skin cells. The skin also helps control body temperature. A layer of cells between the epidermis and the dermis called melanocytes produce a brown-black skin pigment called melanin. Melanin determines the color of the skin‚ eyes‚ and hair. Melanin also helps protect against the damaging rays of the sun. As a person ages‚ melanocytes often spread
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The first test conducted on unknown bacteria 32 was the Gram stain. From this stain‚ unknown 32 was found to be a Gram-positive cocci. This test eliminated all possible Gram-negative bacteria‚ Gram-positive rods and Gram-positive spirillium. Next‚ the endospore test determined whether or not the Gram-positive bacteria contained endospores. With the use of malachite green‚ steam‚ and safranin it was found that unknown bacteria 32 did not contain endospores. This eliminated Gram-positive cocci Sporosarcina
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Chapter 39 Plant Responses to Internal and External Signals No groups of plants is more important to human survival than seed plants plants are key sources of food fuel wood products and medicine our reliance of plants Products from Seed Plants Most of our food comes from angiosperms Six crops yield 80% of the calories consumed by humans Wheat Rice Maize Potatoes Cassava sweet potatoes Other Products from Seed Plants Secondary compounds of seed plants are used in medicines
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Attaches to the substratum by the muscular foot‚ w/c it uses to move slowly about in search for foot. MANTLE Dorsally‚ the body wall over the visceral mass is elaborated to form the mantle or pallium w/c is characteristics of all molluscs Mantle epidermis secretes protein‚ calcium salts‚ and mucus and is also sensory. SHELL Simple‚ low‚ conical cap covering the dorsum of the generalized mollusc Originated in the
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* Get a single layer of plant cells. If you are using red onion‚ cut a 1 cm square from a fleshy piece of onion and then peel off a single layer of the red cells. If you are using rhubarb‚ peel a piece from the epidermis. If you are using toadflax peel a piece of the lower epidermis of a leaf. * Place the strip on a slide and cover it with a drop or two of distilled water. Add a cover slip. * Look at the cells through a microscope. Start with the low power lens. Draw and label 3 plant
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1. Know different types of burns – Superficial (1st degree) o Involves only epidermis o reddening with minor swelling – Partial Thickness (2nd Degree) o Epidermis burned though‚ dermis damaged o Deep‚ intense pain o Blisters and mottling – Full Thickness (3rd Degree) o All layers of skin burned o Blackened areas surrounded by dry white patches – Electrical
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Differentiated/Permanent Cells – specialized in structure and usually do not divide • Simple Permanent Tissue – dermal tissue system and ground tissue system › Dermal tissue system – outer surfaces of the plant › Epidermal tissue – forms the epidermis › Periderm – replaces epidermal tissue. Composed of cork tissue (waterproof walls and dead at maturity) › Ground tissue system – 3 ground tissues: parenchyma‚ sclerenchyma and collenchyma • Complex permanent tissues – vascular system. › Vascular
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phylum Porifera. This group is now known to be polyphyletic‚ and all sponges belong to either phylum Calcarea or phylum Silicea. They are the simplest animals and lack true tissues. Label the following: pores‚ spongocoel‚ epidermis‚ amoebocytes‚ choanocyte‚ flagellum‚ spicules‚ epidermis‚ and mesohyl. On this sketch of a typical sponge‚ explain how water flows through the body of a sponge‚ and describe how it obtains food. 2. What is the feeding method of a sponge? Copyright © 2010 Pearson Education
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it acts as a waterproof protector for all the internal organs and it consist of four distinct layers: The epidermis‚ the basement membrane zone‚ the dermis and the subcutaneous layer. The epidermis which is the outer layer and is a protective multi-layered self-renewing structure which varies in thickness depending on which part of the body it covers. The dermis is underneath the epidermis‚ this is a layer of connective tissue which provides the skins elasticity and strength it also contains sensory
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eventually dying. Water loss via transpiration (loss of water vapour from the aerial parts of a plant due to evaporation) is fundamentally inevitable due to the fact that plants exchange gases with the atmosphere‚ via their stomata-the pores in a leafs epidermis . The bad aspect of this is the fact that the plants must photosynthesise in order to acquire the energy vital for their survival; for this exchange to occur the plant must be able to allow the gases in and out of the leaves‚ and to do this the stomata
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