Presentation03 - Plant and Animal Tissues

1. TissueTissue
an integrated group of cells an integrated group of cells
with a common structure with a common structure
and functionand function

2. Plant tissuesPlant tissues
•Meristematic tissueMeristematic tissue: rapid cell : rapid cell
division, lengthening of shoots and division, lengthening of shoots and
rootsroots
•Dermal tissueDermal tissue: covering for the : covering for the
plant bodyplant body
•Ground tissueGround tissue: support, : support,
photosynthesis, and storage photosynthesis, and storage
•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

3. Meristematic TissueMeristematic Tissue
•cells that cells that do not do not
differentiatedifferentiate
•cells cells retain the ability to retain the ability to
dividedivide
•Types:Types:
–ApicalApical – – primary growthprimary growth
at root and shoot tipsat root and shoot tips
–LateralLateral – – secondary secondary
growthgrowth in trees and in trees and
shrubs shrubs
–IntercalaryIntercalary – – secondary secondary
growthgrowth in monocot in monocot
stemsstems

4. 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

5. 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

6. Ground TissueGround Tissue
PARENCHYMA 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

7. 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

9. All 4 types of tissues
are present in the
root tip

10. Young dicot stem
Young monocot stem

12. FOUR TYPES OF ANIMAL TISSUESFOUR TYPES OF ANIMAL TISSUES

13. 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 and lines
internal organs and cavities
•Barrier against mechanical injury,
invasive microorganisms, and fluid loss
•Provides surface for absorption,
excretion and transport of molecules

14. Types of Types of
Epithelial TissueEpithelial Tissue
Cell shape
1.Squamous
2.Cuboidal
3.Columnar
Number of cell layers
1.Simple
2.Pseudostratified
3.Stratified
RELATE
STRUCTURE TO
FUNCTION!

15. 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

16. Muscle TissueMuscle Tissue
(Movement)(Movement)
•Composed of long cells called
muscle fibers
•Contraction  movement

17. Nervous tissueNervous tissue
(Control)(Control)
Senses stimuli
and transmits
nerve impulses
Single cell body
with long
extensions
(axons and
dendrites)
Axon
Dendrite
Cell body