Front | Back |
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.
|