Lecture+outline+5+-+tissue+level+of+organization (2).docx -...

This preview shows page 1 - 2 out of 6 pages.

Biology 205-03:Human Anatomy and Physiology IFall 2017Lecture outline 5:Tissue level of organizationReading in Martini:Chapter 4A.Introduction to tissues1.General features of tissuesa.Aggregations of cells1.All cells in a tissue may be similar in structure and function2.In most tissues, several cell types are present – cells differ in structure and functionb.Every tissue includes cells and extracellular material2.Four primary tissue types in humans (with subtypes of each primary tissue type)a.Epithelial tissues:cover surfaces and line tubesb.Connective tissues:protect, support, and bind other tissuesc.Muscle tissues are associated with movementsd.Nervous tissues:sense changes, communicate with other tissues, control and coordinate bodyactivitiesB.Cell junctions1.Plasma membrane specializations (protein complexes) at points of contact between neighboring cells2.Types of junctions, with general functions of eacha.Adherens junctions anchor cells to neighboring cellsb.Desmosomes:focal junctions that anchor cells to neighboring cellsc.Hemidesmosomes:focal junctions that anchor cells to extracellular materiald.Tight junctions form fluid-tight seals between cells in a sheete.Gap junctions:communicating junctions that allow direct movement of ions and small moleculesfrom the cytosol of one cell to the cytosol of a coupled neighboring cellC.Epithelial tissues1.General featuresa.Cells are tightly packed together, with little extracellular materialb.Junctions are prominentc.Cells are arranged in sheets; an epithelial sheet may have a single layer of cells or more than onelayer of cellsd.Epithelial cells (and epithelial tissues) are polarized1.Apical (free) and basal (attached) surface2.Basal surface is anchored to a basement membrane (extracellular material)e.Not penetrated by blood vessels (avascular) – must be near blood vessels in other tissuesf.Many epithelial tissues have a high capacity for renewal1.Continual replacement of cells2.High mitotic rate of stem cells associated with the epithelium2.Functions of epithelia are related to location and structural details of the tissue…functions are notnecessarily mutually exclusivea.Protection of underlying tissueb.Filtrationc.Lubricationd.Secretione.Digestionf.Absorption

Upload your study docs or become a

Course Hero member to access this document

We have textbook solutions for you!
/Biology-Concepts-and-Applications-10th-Edition-9781305967335-2/
The document you are viewing contains questions related to this textbook.
Chapter 26 / Exercise 5
Biology: Concepts and Applications
Starr/Evers
Expert Verified

Upload your study docs or become a

Course Hero member to access this document

End of preview. Want to read all 6 pages?

Upload your study docs or become a

Course Hero member to access this document

Term
Fall
Professor
Carlson
We have textbook solutions for you!
The document you are viewing contains questions related to this textbook.
Biology: Concepts and Applications
The document you are viewing contains questions related to this textbook.
Chapter 26 / Exercise 5
Biology: Concepts and Applications
Starr/Evers
Expert Verified

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture