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Ch 4: Tissue

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Title: EPITHELIAL TISSUES Author: Powell High School Science Last modified by: jenndagley Created Date: 9/7/2004 3:47:41 PM Document presentation format – PowerPoint PPT presentation

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Title: Ch 4: Tissue


1
Ch 4 Tissue
  • Groups of cells that are similar in structure and
    perform a common or related functions are called
    TISSUE
  • The study of tissue, or histology, complements
    the study of gross anatomy. Together they
    provide the structural basis for understanding
    organ physiology.

2
Tissues
  • The tissues of the human body include four major
    types general function
  • Epithelial covering
  • Connective support
  • Muscle movement
  • Nervous control

3
Types of Tissue!!
4
EPITHELIAL TISSUES
5
EPITHELIAL TISSUES
  • Epithelial Tissue is a sheet of cells that
    covers a body surface or lines a body cavity
  • Nearly all substances received or given off by
    the body must pass through an epithelium layer.

6
EPITHELIAL TISSUES
  • Epithelial Tissue lacks of blood vessels,
    contains little intercellular material and are
    continually being replaced
  • They function in protection, secretion,
    absorption, filtration, excretion, and sensory
    reception.

7
EPITHELIAL TISSUES
  • Epithelium Tissue has many characteristics that
    separate it from other tissue types
  • ET has Polarity- which means it has an apical
    surface (near the top) and a basal surface (near
    the bottom)
  • Specialized Contacts
  • Supported by connective tissue.

8
EPITHELIAL TISSUES
  • Each Epithelium Tissue is given two names.
  • The first name indicates the number of cell
    layers present.
  • Simple- one layer
  • Stratified- more than one layer
  • The second describes the shape of its cells
  • Squamous, cuboidal, and columnar.
  • .

9
EPITHELIAL TISSUES
  • .

10
Simple Squamous Epithelium
  • This tissue consists of a single layer of thin,
    flattened cells through which substances can pass
    easily. So delicate they can easily be damaged.
  • Common site of diffusion and osmosis. Its
    functions in the exchange of gases in the lungs
  • Lines the air sacs of the lungs (gas exchange),
    forms the walls of the capillaries, lines the
    insides of blood vessels and lymph vessels.
  • Covers the membrane that line body cavities.
  • EX Cheek Cells

11
Simple Squamous Epithelium
12
Simple Squamous Epithelium
13
Simple Cuboidal Epithelium
  • This tissue consists of a single layer of
    cube-shaped cells. Usually have a centrally
    located spherical nuclei
  • It carries on secretion and absorption. Secretes
    glandular products.
  • Covers the ovaries, lines the kidneys, tubules
    and ducts of certain glands like pancreas and the
    liver.

14
Simple Cuboidal Epithelium
15
Simple Cuboidal Epithelium
16
Simple Columnar Epithelium
  • The tissue is composed of a single layer of
    elongated cells whose nuclei are usually at about
    the same level, near the basement membrane.
  • Some have cilia some do not
  • Secretes and absorbsthis tissue is thick!!
  • This tissue lines uterus and portions of the
    digestive tract like small/large intestines and
    stomach.

17
Simple Columnar Epithelium
18
Simple Columnar Epithelium
19
Simple Columnar Epithelium
20
Pseudostratified Columnar Epithelium
  • They appear stratified but are NOT, They appear
    to have two or more nuclei but they each reach
    the basement level.
  • Goblet cells scattered throughout the tissue that
    secret mucus, which the cilia sweep away.
  • It lines tubes of the respiratory system. The
    mucus and cilia created by this tissue trap the
    dust and microorganisms that enter the airway.

21
Pseudostratified Columnar Epithelium
  • C the nuclei appear at various levels giving it
    the stratified appearance
  • B the cilia can easily be seen

22
Pseudostratified Columnar Epithelium
23
Pseudostratified Columnar Epithelium
24
Stratified Squamous Epithelium
  • Named for the shape of the cells,consists of
    many layers, relatively thick. Cells nearer the
    surface are flat where as the deeper are cuboidal
    and columnar.
  • Tissue can contain Keratin, which is a protein
    that accumulates and protect the underlying
    tissue.
  • Epidermis-outer most layer of the skin
  • Also lines the skin and lines the oral cavity,
    throat, vagina, and anal canal.

25
Stratified Squamous Epithelium
  • Observe that the surface cells (at B) are
    flattened (are squamous).

26
Stratified Squamous Epithelium
27
Stratified Cuboidal Epithelium
  • This tissue is composed of two or thee layers of
    cube-shaped cells.
  • It lines the larger ducts of the mammary glands
    sweat glands, salivary glands, and pancreas.
    Forms the lining of ovarian follicles and
    seminiferous tubules
  • It functions in protection.

28
Transitional Epithelium
  • This tissue is specialized to change in response
    to tension..
  • Transition epithelium is unstretched and consists
    of many layers when the organs wall contract the
    tissue stretches and appears thinner when the
    organ is distended.
  • Forms the lining of the urinary bladder and lines
    the ureters and part of the urethra.

29
Transitional Epithelium
30
Transitional Epithelium
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