Presentation03 - Plant and Animal Tissues

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Presentation03 - Plant and Animal Tissues

  1. 1. Tissue an integrated group of cells with a common structure and function
  2. 2. Plant tissues <ul><li>Meristematic tissue : rapid cell division, lengthening of shoots and roots </li></ul><ul><li>Dermal tissue : covering for the plant body </li></ul><ul><li>Ground tissue : support, photosynthesis, and storage </li></ul><ul><li>Vascular tissue : conduction of water, food, and dissolved minerals; strengthens and supports the plant </li></ul>
  3. 3. Meristematic Tissue <ul><li>cells that do not differentiate </li></ul><ul><li>cells retain the ability to divide </li></ul><ul><li>Types: </li></ul><ul><ul><li>Apical – primary growth at root and shoot tips </li></ul></ul><ul><ul><li>Lateral – secondary growth in trees and shrubs </li></ul></ul><ul><ul><li>Intercalary – secondary growth in monocot stems </li></ul></ul>
  4. 4. Apical meristem <ul><li>In shoot tips and root tips </li></ul><ul><li>Allium cepa root tip </li></ul>Root cap Apical meristem Region of cell differentiation/maturation Region of cell elongation Region of cell division
  5. 5. Dermal Tissue <ul><li>Single layer of cells called the epidermis in herbaceous plants </li></ul><ul><ul><li>guard cells </li></ul></ul><ul><ul><li>trichomes </li></ul></ul><ul><ul><li>root hairs </li></ul></ul><ul><li>Functions </li></ul><ul><ul><li>absorption </li></ul></ul><ul><ul><li>secretion of cuticle </li></ul></ul><ul><ul><li>protection </li></ul></ul><ul><ul><li>control of gas exchange </li></ul></ul>Epidermis Cuticle
  6. 6. Ground Tissue PARENCHYMA COLLENCHYMA SCLERENCHYMA Characteristics <ul><li>spherical </li></ul><ul><li>thin-walled </li></ul><ul><li>living, metabolizing tissue </li></ul><ul><li>elongated cells with unevenly thickened cell walls </li></ul><ul><li>alive at maturity </li></ul><ul><li>with primary and secondary cell walls </li></ul><ul><li>dead at functional maturity </li></ul>Location <ul><li>throughout the plant </li></ul><ul><li>beneath the epidermis in young stems and in leaf veins </li></ul><ul><li>fibers in wood, bark, leaves, stems </li></ul><ul><li>sclereids in fruits and seeds </li></ul>Functions <ul><li>photosynthesis and respiration </li></ul><ul><li>storage </li></ul><ul><li>regeneration </li></ul><ul><li>flexible support system </li></ul><ul><li>structural support </li></ul>Appearance
  7. 7. Vascular Tissue <ul><li>Xylem </li></ul><ul><ul><li>Conducts water and dissolved minerals from the roots </li></ul></ul><ul><li>Phloem </li></ul><ul><ul><li>Conducts dissolved food materials, carbohydrates, in solution </li></ul></ul><ul><li>Continuous throughout plant </li></ul><ul><li>Support plant body </li></ul>
  8. 9. All 4 types of tissues are present in the root tip
  9. 10. Young dicot stem Young monocot stem
  10. 12. FOUR TYPES OF ANIMAL TISSUES
  11. 13. Epithelial Tissue (Covering) <ul><li>Tightly-joined closely-packed cells </li></ul><ul><li>One side of exposed to air or internal fluid, other side attached to a basement membrane </li></ul><ul><li>Covers outside of the body and lines internal organs and cavities </li></ul><ul><li>Barrier against mechanical injury, invasive microorganisms, and fluid loss </li></ul><ul><li>Provides surface for absorption, excretion and transport of molecules </li></ul>
  12. 14. Types of Epithelial Tissue <ul><li>Cell shape </li></ul><ul><ul><li>Squamous </li></ul></ul><ul><ul><li>Cuboidal </li></ul></ul><ul><ul><li>Columnar </li></ul></ul><ul><li>Number of cell layers </li></ul><ul><ul><li>Simple </li></ul></ul><ul><ul><li>Pseudostratified </li></ul></ul><ul><ul><li>Stratified </li></ul></ul><ul><li>RELATE STRUCTURE TO FUNCTION! </li></ul>
  13. 15. <ul><li>Binding and support of other tissues </li></ul><ul><li>Large amount of extracellular matrix with fewer cells </li></ul><ul><li>ECM - network of fibers in liquid, jelly-like or solid matrix </li></ul>
  14. 16. Muscle Tissue (Movement) <ul><li>Composed of long cells called muscle fibers </li></ul><ul><li>Contraction  movement </li></ul>
  15. 17. Nervous tissue (Control) <ul><li>Senses stimuli and transmits nerve impulses </li></ul><ul><li>Single cell body with long extensions (axons and dendrites) </li></ul>Axon Dendrite Cell body

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