ONION EPIDERMIS INTRODUCTION An eukaryote is an organism whose cells contain a nucleus and other structures (organelles) enclosed within membranes. Plant cells are eukaryotic cells that differ in several key aspects from the cells of other eukaryotic organisms. Their distinctive features include: A large central vacuole a water-filled volume enclosed by a membrane known as the tonoplast which maintains the cell’s turgor (provide structural support) and controls movement of molecules between the cytosol
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Gland 4. Hair Follicle 5. Sweat Gland 6. Lamellar corpuscle 7. Hypodermis 8. Dermis 9. Epidermis 10. Tachtile corpuscle 11. Dermal papilla 12. Sweat pores Questions A. How does the skin tan when exposed to ultraviolet light? Melamin synthesis are stimulated by the UV light which darkens the skin. B. Describe the functions of the epidermis. The epidermis is the outermost layer of the skin. This layer of skin acts as a barrier to help protect the body
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skin is cover by layer of epidermis which have further 5 layers named as the lower or dense layer is stratum basale(germinativum) and the next upper layer is stratum spinosum the third upper layer is stratum granulusum and the fourth upper laer is stratum lucidum and the uppr last layer of the epidermis is stratum cornum layer which cover the whole body upper surface.the epidermis layer of the skin is nonvascular layer there is no blood vessels presents. Below the epidermis layer is the next layer
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SHEET EXERCISE 5.29.2012 LAB TIME/DATE _______________________ The Integumentary System Basic Structure of the Skin 1. Complete the following statements by writing the appropriate word or phrase on the correspondingly numbered blank: Epidermis The two basic tissues of which the skin is composed are dense irregular 1. _____________________________ connective tissue‚ which makes up the dermis‚ and 1 ‚ which forms the epiKeratin dermis. The tough water-repellent protein found in the epidermal
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Unit 4 Lecture Study Guide Use the lecture folder to help you complete this guide. The more detail you can provide the better prepared for the test you will be. 1. What is the integumentary system and its primary characteristics? - the skin and its derivates (sweat and oil glands‚ hairs and nails) - provides external protection for the body 2. Describe and give at least one example of each of the functions of the integumentary system. 1. Protection- skin secretions
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covers the rest of our body. The two types of skin share a lot of characteristics‚ but they also have differences which warrant a different classification. They are similar in that both are composed of 3 major layers: the epidermis‚ the dermis‚ and the hypodermis. The epidermis is where the epithelial cells are located‚ the dermis are where connective tissues‚ nerves‚ and blood vessels start to appear‚ and the hypodermis is where fat cells are located. The dermis of both tissues are divided into
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with the basic structure of the skin‚ and as we probably know‚ the skin consists of two layers: dermis and epidermis. The epidermis has only one type of structures which are cells -no blood vessels‚ no lymphatics-‚ and the majority of those cells (about 85% of those cells) are called “keratinocytes”. The rest are called melanocytes‚ merkel cells‚ and langerhans cells. The cells in the epidermis are arranged into 4 layers: * Basal layer: it is where we have mitosis‚ and then the cells will migrate
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Function of the Skin The skin is more than just external covering. It acts as a sensitive boundary between our bodies and the environment. The skin has several important functions‚ for example: Protection‚ temperature regulations‚ waste removal and sense of touch. Protection • The skin acts as a protective organ. The film of sebum and sweat on the surface of the skin (acid mantle). It acts as an anti-bacterial agent to help prevent the multiplication of micro-organisms on the skin. • The fat
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Thalgo was taken over in the year 1999 the company was founded in the south of France. Using the benefits of algae and active marine ingredients in Cosmetics. The sea contains all traces and micro- nutrients all essential to the human metabolism. Algae has the extra ordinary ability to concentrate all the riches of marine life. Algae can contain up to 1000 times more iodine‚ 100 times more calcium‚ and 10 times more magnesium than a land plant. Algae is also rich in vitamins and once dried with the
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Corpuscles that exist there Know that Skin accounts for 7% of the body weight (9 11 lbs) Know how to calculate percent skin from a given weight and vice versa. Know the name‚ shape‚ and characteristics of the cell types that exist in the Epidermis Keratinocytes keratin producing cells that allow the skin to have its protective effect. Melanocytes the spider shaped cells that produce melanin‚ a dark pigment. Merkel Cells Spiked like hemisphere cell important for touch sensation
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