Tissue Tissue an integrated group of cells with a common structure and function.
-
Upload
scott-richardson -
Category
Documents
-
view
217 -
download
0
Transcript of Tissue Tissue an integrated group of cells with a common structure and function.
TissueTissuean integrated group of cells an integrated group of cells
with a common structure with a common structure and functionand function
Plant tissuesPlant tissues1.1. Meristematic tissueMeristematic tissue: rapid cell : rapid cell
division, lengthening of shoots and division, lengthening of shoots and rootsroots
2.2. Dermal tissueDermal tissue: covering for the : covering for the plant bodyplant body
3.3. Ground tissueGround tissue: support, : support, photosynthesis, and storage photosynthesis, and storage
4.4. Vascular tissueVascular tissue: conduction of : conduction of water, food, and dissolved water, food, and dissolved minerals; strengthens and minerals; strengthens and supports the plantsupports the plant
Apical meristemApical meristem
• In shoot tips and In shoot tips and root tipsroot tips
• Allium cepaAllium cepa root tip root tip
Root cap
Apical meristemApical meristem
Region of cell Region of cell differentiationdifferentiation/maturation/maturation
Region of cell Region of cell elongationelongation
Region of cell Region of cell divisiondivision
Dermal TissueDermal Tissue• Single layer of cells called Single layer of cells called
the the epidermisepidermis in in herbaceous plantsherbaceous plants– guard cellsguard cells– trichomestrichomes– root hairsroot hairs
• FunctionsFunctions– absorptionabsorption– secretion of cuticlesecretion of cuticle– protectionprotection– control of gas exchangecontrol of gas exchange
Epidermis
Cuticle
Ground TissueGround TissuePARENCHYMA COLLENCHYMA SCLERENCHYMA
Characteristics • spherical• thin-walled• living, metabolizing tissue
• elongated cells with unevenly thickened cell walls• alive at maturity
• with primary and secondary cell walls• dead at functional maturity
Location • throughout the plant • beneath the epidermis in young stems and in leaf veins
• fibers in wood, bark, leaves, stems• sclereids in fruits and seeds
Functions • photosynthesis and respiration• storage• regeneration
• flexible support system
• structural support
Appearance
Vascular TissueVascular Tissue
• Xylem– Conducts water and dissolved
minerals from the roots
• Phloem– Conducts dissolved food
materials, carbohydrates, in solution
• Continuous throughout plant
• Support plant body
All 4 types of tissues are present in the
root tip
Young dicot stem Young monocot stem
FOUR TYPES OF ANIMAL FOUR TYPES OF ANIMAL TISSUESTISSUES
Epithelial TissueEpithelial Tissue(Covering)(Covering)• Tightly-joined closely-packed cells• One side of exposed to air or internal
fluid, other side attached to a basement membrane
• Covers outside of the body; lines internal organs and cavities
• Barrier against mechanical injury, invasive microorganisms, fluid loss
• Provides surface for absorption, excretion and transport of molecules
Types of Types of Epithelial Epithelial TissueTissueCell shape
1. Squamous2. Cuboidal3. Columnar
Number of cell layers1. Simple2. Pseudostratified3. Stratified
RELATE STRUCTURE TO FUNCTION!
Binding and support of other tissues Large amount of extracellular matrix with
fewer cells ECM - network of fibers in liquid, jelly-like or
solid matrix
Muscle TissueMuscle Tissue(Movement)(Movement)
• Composed of long cells called muscle fibers
• Contraction movement
Nervous tissueNervous tissue(Control)(Control)
Senses stimuli and transmits nerve impulses
Single cell body with long extensions (axons and dendrites)
Axon
Dendrite
Cell body