8.31.09 Tissues - *There will be no pictures on exams,...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
*There will be no pictures on exams, besides simple chambers The Tissue Level of Organization 0. Group of similar cells 0. common embryonic origin 1. common function 1. Histology : Study of tissues 2. Pathologist : looks for tissue changes that indicate disease 4 Basic Tissues 3. Epithelial Tissue - covers surfaces because cells are in contact -lines hollow organs, cavities, and ducts -forms glands when cells sink under the surface 4. Connective Tissue -material found between cells -supports and binds structures together -stores energy as fat -provides immunity to disease -blood is a liquid connective tissue 5. Muscle Tissue - cells shorten in length producing movement 6. Nerve Tissue - cells that conduct electrical signals -detects changes inside and outside the body -responds with nerve impulses Origin of Tissues 7. Primary germ layers within the embryo -endoderm -mesoderm -ectoderm 8. Tissue derivations 2. epithelium from all 3 germ layers 3. 4. nerve tissue from ectoderm Biopsy
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
9. Removal of living tissue for microscopic examination -surgery -needle biopsy 10. Useful for diagnosis, especially cancer 11. Tissue preserved, sectioned and stained before microscopic viewing Cell Junctions o Tight junctions: - Watertight seal between cells -plasma membranes fused with a strip of proteins -common between cells that line the GI and bladder o Adherens junctions -Holds epithelial cells together. Structural components -plaque = dense layer of proteins inside the cell membrane -microfilaments extend into the cytoplasm -integral membrane proteins connect to membrane of other cell o Gap junctions -tiny space between plasma membranes of two cells - crossed by protein channels called connexons forming fluid filled tunnels -cell communication with ions and small molecules -muscle and nerve impulses spread from cell to cell -heart and smooth muscle of gut o Desmosomes -resist cellular separation and cell disruption -similar structure to adherens junction except intracellular intermediate filaments cross cytoplasm of cell -cellular support of cardiac muscle o Hemidesmosomes -Half a desmosome -connect cells to extracellular material -basement membrane
Background image of page 2
Tight Junctions o Watertight seal between cells o Plasma membranes fused with a strip of proteins Adherens Junctions 0. Holds epithelial cells together 1. Structural components Desmosomes o Resists cellular separation and cell disruption o Similar structure to adherens junction except intracellular intermediate filaments cross cytoplasm of cell o Hemidesmosomes o Half a desmosome o Connect cells to extracellular material 0. Gap Junctions o Tiny space between plasma membranes of 2 cells o Crossed by protein channels called connexons forming fluid filled tunnels o o Muscle and nerve impulses spread from cell to cell 5. Epithelial Tissue -- General Features
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 09/07/2009 for the course V SC 315 taught by Professor - during the Spring '09 term at University of Arizona- Tucson.

Page1 / 19

8.31.09 Tissues - *There will be no pictures on exams,...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online