elde eenlagige saamgeste lde eenlagige saamgest elde gesilieerde glandular

Elde eenlagige saamgeste lde eenlagige saamgest elde

This preview shows page 68 - 72 out of 117 pages.

elde eenlagige saamgeste lde eenlagige saamgest elde gesilieerde glandular simple stratified simple stratfied simple stratfied ciliated pseudo transitiona l stratified epithelium Diagnostiese eienskappe Diagnostic characteristics eenvoudige tekening simple drawing aanpassings en funksies adaptations and functions plek van voorkoms locality
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Study unit 5 61 Individual exercise Use the questions below to guide you through the work in Mader and Windelspecht. The following questions refer to the diagrams of epithelial tissue given in figure 5.2. 1. Match the functions and the diagrams giving the main characteristics of epithelium tissues with the names of the epithelium tissues. (10) 2. How is each of the tissues, A to E, adapted for its functions? (10) 3. Name three different types of junctions that occur between epithelial cells and discuss the link between the kind of junction and the function of the epithelium. (6) 4. Critically evaluate the importance of epithelium for the human body by referring in particular to its role in the respiratory, excretory and digestive systems. (6) FIGURE 5.2: EPITHELIAL TISSUES 1. 2. 3. 4. 5. A Ciliated columnar (I) Lines stomach, small intestine (duodenum, ileum), part of air ways B Columnar (II) Lines mouth, oesophagus, alveoli in lungs gaseous exchange takes place through them. Endothelium inside bloodvessels C Squamous (III) Withstand wear and tear e.g. skin. Outer layers dead D Stratified squamous (IV) Lines convoluted tubules in kidney and various glands like thyroid E Cuboidal (V) Lines Fallopian tubes (moving eggs) and sperm tubes, air ways nose, trachea, bronchi (cleaning airways), inside central canal of spinal cord 5. The epidermis (i.e. the epithelium of the skin) is also an epithelium tissue. 5.1 What kind of epithelium is the epidermis? (1) 5.2 What is responsible for the difference in thickness between the skin of our foot soles and the thin skin around our eyes? (2) 6. Explain why mainly multi-layered epithelia and not single layered epithelia can be found in the oesophagus. (2) Basal membrane with collagen Elongated nucleus close to base Goblets unicellular glands cilia
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Study unit 5 62 7. Distinguish between a goblet cell, exo- and endocrine glands. (5) 8. Which structure separates all epithelial tissues from the underlying tissue? (1) 9. Classify the types of epithelial tissue A to J given in figure 5.3. (10) A B C D E F G H I J FIGURE 5.3: EPITHELIUM TISSUES Control your own answers using the listed sources. Practical/ Microscope work 8 1. Use available micrographs / microscope slides to draw labelled diagrams of a variety of epitheliums. Use basic characteristics to identify them. Keep this for your practical portfolio . (10) 2. Use a clean cotton bud to remove some cells from the inside of your cheek. Smear it on a microscope slide and let it dry. Flame it 3 to 4 times, with side on which smear is away from flame. Cover for 1 minute with crystal violet (gentian violet). Rinse, dry and study. Try to find some cheek epithelium cells. Draw, identify and label a few of these cells. Keep this for your practical portfolio . (10)
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Study unit 5 63 5.2 CONNECTIVE TISSUE
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  • Spring '16
  • Ambani Mudau
  • Phylum, Windelspecht

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