BIO Ch 4- The Tissue Level of Organization.docx - 1...

This preview shows page 1 - 3 out of 15 pages.

1Biology: Human Anatomy and PhysiologyCH. 4: THE TISSUE LEVEL OF ORGANIZATION1.Define the term tissue, and classify the tissues of the body into four major types.A.tissueA tissue is a group of cells that usually have a common origin and function, andthey work together to carry out a specific activity.B.histologyThe science that deals with the study of tissuesI.epithelial tissuecovers body surfaces and lines hollow organs, body cavities, and ducts; italso forms glands. This tissue allows the body to interact with both itsinternal and external environments.Most common type of tissueII.connective tissueprotects and supports the body and its organs. Various types ofconnective tissues bind organs together, store energy reserves as fat, andhelp provide the body with immunity to disease-causing organisms.III.muscular tissueis composed of cells specialized for contraction and generation of force.In the process, muscular tissue generates heat that warms the body.IV.nervous tissuedetects changes in a variety of conditions inside and outside the body andresponds by generating electrical signals called nerve action potentials(nerve impulses) that activate muscular contractions and glandularsecretions.2.What are some key differences in function among thefour tissue types?Epithelial tissuecovers the body, lines various structures, and forms glands.Connective tissueprotects, supports, binds organs together, stores energy, and helpsprovide immunity.Muscular tissuecontracts and generates force and heat.Nervous tissuedetects changes in the environment and generates nerve impulses thatactivate muscular contraction and glandular secretion3.What is abiopsy?A biopsy is the surgical removal of a sample via a needle or syringe of living tissue formicroscopic examination.This is used to help diagnose many disorder, especially cancer.4.Describe the structure and functions of the five principal types of cell junctions.A.cell junction
2Cell junctions Are contact points between the plasma membranes of the tissuecells. There are five different types of cell junctions:1.tight junctionWeb like strands of transmembrane proteins.they fused togetherthe outside surfaces of the adjacent plasma membranethey allow the passage of substances between cells and preventthe contents of the organs from leaking into the blood orsurrounding tissue.tissues that line the stomach,intestines,urinary bladder.2.adherens junctionThese contain plaque,which is a dense layer of protein on theinside of the plasma membrane,this attaches both to themembrane protein and to the microfilaments of the cytoskeleton.Cadherins join the cellsThese Junctions are known for zones called “adhesion belts”because they encircle the cell.

Upload your study docs or become a

Course Hero member to access this document

Upload your study docs or become a

Course Hero member to access this document

End of preview. Want to read all 15 pages?

Upload your study docs or become a

Course Hero member to access this document

Term
Fall
Professor
Allan Kew
Tags

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture