Chapter_04_Tissues.ppt.pptx - Anatomy and Physiology I BIOL...

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BIOL 2401AnatomyandPhysiologyIChapter 4Tissues
Chapter 4 TissuesLearning objectives:Identify four types of tissues that make up human bodyDescribe epithelial tissue: types, location in the body, and functionsDescribe connective tissue: types, location in the body, andfunctionsDescribe epithelial and connective tissue membranes that line bodycavities and cover organsDescribe muscle tissue: types, location in the body, and functionsDescribe nervous tissue: types, location in the body, and functionsDescribe inflammation and repair following tissue injuries
TissuesGroup of cells with common embryonic origin that performspecialized functions.Histology:the study of tissuesCytology:the study of cellsPathology:the study of tissues associated with a diseaseBiopsy:the study of tissue sample from a patient to makemedical diagnosisAutopsy:the study of tissue sample from a dead person todiscover the cause of death
Cell connectionsMany cells of the body are connected to each other attheir plasma membrane.Cell Junctions:the structures that connect and allow forthe cells to work together as functional units.Three of the most common cell junctions are:Tight junctionsGap junctionsDesmosomes
Tight JunctionsConsist of proteins that attach plasma membranes of adjacent cellsAllow for the formation of a tight seal between cells; inhibiting themovement of material between cellsSeen in the cells that line the stomach, intestines and urinarybladder.
Gap JunctionsProteins (connexons) form tunnels (connexons) that function as aconnecting point between cells.Allows for the movement of small molecules and ions between cells.Allows the transportation of nutrients and electrical signals betweensome cells.
DesmosomesInvolve Cell adhesion molecules (CAMs).Attach to intermediate filaments of cell cytoskeleton Function to bind cellstogether.Seen in the epidermis (outermost skin layer) and in cardiacmuscle cells.
Review time!1.Animation of cell junctions2.Labeling exercise – Acivity 6.33.Can you answer the following questions?What are cell junctions?Why do cells need these junctions?What are three major types of junctions?What is the difference between tight and gap junctions?What is the difference between tight junctions anddesmosomes?Can you name cells in the body that are free floating and donot form junctions with the neighboring cells?
Tissues typesEpithelial:covers the body, lines body cavities, holloworgans and ducts, and forms glands.Connective:provides protection, support, immunity, andenergy storage site for the body.Muscle:allows for body movement, heat generation andmovement of material within the body.

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