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Tissues. Chapter 5. Tissues . Groups of cells to perform specialized structural and functional roles. 4 major types of tissues: Epithelial Connective Muscle Nervous. Epithelial Tissue. EpT. Epithelial Tissue.

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Tissues

Tissues

Chapter 5


Tissues1
Tissues

  • Groups of cells to perform specialized structural and functional roles




Epithelial tissue1
Epithelial Tissue

  • Cover all body surfaces both interior and exterior, the major tissue of most organs



Functions
Functions by a basement membrane.

  • Secretion

  • Absorption

  • Excretion

  • Sensory reception

  • protection


Types
Types by a basement membrane.

Simple squamous

Simple cuboidal

Simple columnar

Pseudostratified columnar

Stratified squamous

Transitional epithelium


1 simple squamous
1. Simple squamous by a basement membrane.

  • Single layer of thin flattened cells.

  • Cells are tightly packed

  • Nuclei are broad and thin

  • Located in areas of diffusion


2 simple cuboidal
2. Simple cuboidal by a basement membrane.

  • Single layer of cubed cells

  • Centrally located spherical nucleus

  • Located in areas of secretion


3 simple columnar
3. Simple Columnar by a basement membrane.

  • Single layer of elongated cells

  • Nuclei located in a line near the basement membrane



4 pseudostratified columnar
4. Pseudostratified Columnar by a basement membrane.

  • Appear layered (Are NOT!)

  • Nuclei are located at more than one level

  • Goblet cells spread throughout



5 stratified squamous epithelium
5. Stratified Squamous by a basement membrane.Epithelium

  • Many layers of cells making a relatively thick tissue

  • Cells reproduce in deep layers, older cells are pushed outward to die and be sloughed off.



6 transitional epithelium
6. Transitional Epithelium by a basement membrane.

  • Specialized to deal with changing tension.

  • When an organ is contracted the cells appear layered

  • Lining may stretch to 1 cell thick.


Connective tissue

Connective Tissue by a basement membrane.

CT


Connective tissue1
Connective Tissue by a basement membrane.

  • The most abundant tissue type by weight.

  • Tissue varies in consistency from liquid semi-solid solid.



Functions1
Functions by a basement membrane.

  • Provides support

  • Serves as framework

  • Fills spaces

  • Stores fat

  • Produces blood cells


6. Provides protection against infection by a basement membrane.

7. Helps repair tissue damage



Cell types
Cell Types by a basement membrane.

  • Resident cells: present in stable numbers

  • Wandering cells: appear temporarily in injured tissues

  • Mast cells: large, widely distributed, release heparin and histamine.


Fiber types
Fiber Types by a basement membrane.

  • Collagenous: relatively thick, flexible but not very elastic, withstands a pulling force. (tendon)

  • Elastic: not as strong but very elastic (vocal)

  • Reticular: very thin, highly branched, form delicate supporting networks.


Ct types
CT types by a basement membrane.

  • Loose CT (areolar):

    • binds skin to underlying organs

    • fills spaces between muscle

    • contains numerous blood vessels

    • Layered fibers separated by a gel-like substance


2. Adipose (fat): by a basement membrane.

  • Store fats in droplets

  • Found beneath the skin, between muscles, and around organs

  • Used for protection and insulation


3. Fibrous CT: by a basement membrane.

  • Poor blood supply

  • Densely packed tissue

  • Withstand strong pulling force


4. Cartilage: by a basement membrane.

  • Rigid CT

  • Chondrocytes develop in lacunae

  • Covered in perichondrium

  • Blood supplied by perichondrium


  • Cartilage types: by a basement membrane.

    • Hyaline: delicate, trachea

    • Elastic: flexible, ears

    • Fibrocartilage: shock absorbing, intervertebral discs


5. Bone: by a basement membrane.

  • Most rigid CT

  • Due to mineral salts


6. Blood: by a basement membrane.

  • Most fluid

  • Function in transport and regulation

  • Components:

    • Plasma: fluid

    • RBC: carry oxygen

    • WBC: immune function

    • Platelets: cellular particles


Muscle tissue

Muscle Tissue by a basement membrane.

MT


Muscle tissue1
Muscle Tissue by a basement membrane.

  • Contractile fibers

  • Skeletal

  • Smooth

  • Cardiac


Nervous tissue

Nervous Tissue by a basement membrane.

NT


Nervous tissue1
Nervous Tissue by a basement membrane.

  • Highly conductive

  • Brain, spinal cord, and peripheral nerves

  • Neurons: individual nerve cells

  • Neuroglial cells: support cells, connect neurons to blood vessels


Look over the aids to understanding

Look over the Aids to understanding. by a basement membrane.


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