Anatomy and Physiology Ch.4 (exam 2)

The tissue level of organization

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Tissues
Groups of cells with a common embryonic origin that function together to carry out specialized activities.types range from hard (bone) to semisolid(fat) to liquid(blood)
Histology
Study of the microscopic anatomy of cells and tissues.a branch of pathology
Intracellular junctions
Tissues are held together by a variety of these.connects adjacent cells mechanically at the cell membranes or through cytoskeletal elements within and between cells.
Tight junctions
Formed where a leakproof seal is needed between cells. keeps materials from leaking out of organs like the stomach and bladder.
Adherens junctions
Make an adhesion belt(like the belt on your pants) that keeps tissues from seperating as they stretch and contractuse cadherin glycoprotein that forms the belt-like plaque.
Desmosomes
Act as "spot welds".use cadherin glcoprotein(plus intermediate filaments) to hook into the cytoplasm.
Gap junctions
Pores(connexons) that allow small substances like ions to pass between cells. If one of the cell gets sick or dies, these seal like a hatch to prevent damage to other cells.
What are the 4 basic tissues?
Epithelial,Connective,Muscular,Nervous.
Epithelial tissue
Covers body surfaces and form glands and line hollow organs, body cavities, and ducts.
Connective Tissue
(C.T.) protect,support, and bind organs.fat is a type of C.T. that stores energyred blood cells, white blood cells, and platelets are all C.T
Muscular Tissue
Generate the physical force needed to make a body structures move. They also generate heat used by the body.
Nervous Tissue
Detects changes in the body and respond by generating nerve impulses.
The three primary germ layers that tissues of the body develop from
Endoderm,Mesoderm, and EctodermEpithelial from all three. C.T. and muscle are derived from mesoderm. Nervous tissue from ectoderm.
Simple Squamous Epithelial
Composed if a single layer for flat cells found:in the air sacs of the the lungsin the lining of blood vessels, the heart, and lymphatic vesselsin the capillaries, including those in the kidneyas the major part of a serous membane
Simple Cuboidal Epithelium
Composed of a single layer of cube shaped cellsOften found lining the tubules of the kidneys and many other glands.