Presentation on theme: "Tissues Tissues – group of similar cell types that perform a common function The human body has four basic types of tissue: Epithelial Connective Muscle."— Presentation transcript:
1 TissuesTissues – group of similar cell types that perform a common functionThe human body has four basic types of tissue:EpithelialConnectiveMuscleNervous
3 Tissues – Epithelial Tissue Epithelium is tightly packed sheets of cells that line organs and outer surfaces, as well as the insides of hollow organs, vessels, and body cavities.
4 Epithelial TissueEpithelia are typically anchored on one face, but free on anotherThe free side is typically exposed to the environment of body fluidsCan be single layer or many layers thickFunction in protection, secretion, and absorptionEpithelial cells are continuously sloughing off and are replaced by cell division
5 Tissues – Epithelial Tissue Many organs are lined with epithelial tissue
10 Tissues – Epithelial Tissue Many organs are lined with epithelial tissueSimple Columnar Epithelial Tissue – large intestine
11 Tissues – Epithelial Tissue Many organs are lined with epithelial tissueCiliated Pseudostratified Columar Epithelial Tissue - trachea
12 Tissues– Connective Tissue Loosely organized and composed of cells embedded in a matrixMatrix is composed ofprotein fibers andground substanceUsually binds organs or tissues to one another
13 Tissues – Connective Tissue Six different types:Loose connective tissueAdipose tissueBloodFibrous connective tissueCartilageBone
14 Tissues – Connective Tissue Loose connective tissueMost widespread tissue in animal bodyMatrix composed of collagen and elastin fibersIt is called “loose” because of the fibers that are loosely woven togetherBinds epithelia to tissues, pads the skin, and holds organs in place
22 Tissues – Connective Tissue Fibrous connective tissueForms tendons and ligamentsMatrix is densely packed collagen fibers running in parallel.
23 Fibrous connective tissue Nuclei of fibroblasts
24 Tissues – Connective Tissue CartilageCellular component chondrocytesChondrocytes secrete own matrixCartilage cushions joints, formssupport for ears and noseNot vascularized, so takes a long time to heal if injured
27 Tissues – Connective Tissue BoneRigid connective tissueOsteoblasts secrete matrix that is composed of collagen fibers and calcium saltsOsteocytes maintain the hardened bone matrixBody can make use of calcium from bones if dietary levels are too low
33 Tissues – Nervous Tissue Neurons conduct electrical signals and compose the cells of the brain and spinal cordMain functions of neurons are to:Sense stimuliProcess stimuliTransmit signalsMost cells of nervous system do not undergo cell division
36 Tissues – Tissue Donation One person’s tissues can improve the lives of as many as 50 people.Injuries from motor vehicle accidents, burst blood vessels, and drowning are common causes of brain death.Once dead, brain cells cannot recover.Brain dead is different than being in a coma or vegetative state.Tissues can be treated to remove any proteins that a person’s immune system may react to so there is no need for donor matching.
37 Tissues – Tissue Donation Types of tissuesCorneasEye tissueSkinBonesTendonsVeinsHeart valves