ireland3e_lecture_ch05

ireland3e_lecture_ch05 - 8/18/2011 Chapter 5 Tissues Tissue...

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8/18/2011 1 Chapter 5 Tissues Tissue Types Cells are the building blocks of tissues The human body has four tissue types: Epithelial Connective Muscular Nervous
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8/18/2011 2 Epithelial Tissue Epithelial tissue covers the body lines all cavities composes the glands It has neither blood vessels nor any extracellular substances between the cells Epithelial Tissue Epithelial types are identified by both the number of cell layers and the shape of the cells in the upper layer There are eight basic types of epithelium six identified by both the number of cells and their shape two named for the type of cell found in them transitional pseudostratifed Epithelial cells can be flattened, cube-like, or columnar Each shape mirrors the function of the tissue
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8/18/2011 3 Epithelial Tissue Epithelial Tissue Flattened cells, reminiscent of fried eggs, are called squamous cells squamous epithelium is thin enough to form a membrane through which compounds can move via diffusion Cuboidal and columnar epithelia are plumper and usually compose mucous membranes Simple epithelium has one layer of cells and usually functions as a diffusion or absorption membrane the lining blood vessels the lining of respiratory membranes Stratified epithelia have many layers of cells and are designed for protection outer layer of skin salivary gland ducts
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8/18/2011 4 Epithelial Tissue Glands are composed of epithelial tissue Glands are classified by how their secretions are released glands that secrete into ducts are exocrine glands salivary glands, sweat glands endocrine glands have no ducts, they secrete directly into the surrounding extracellular fluid endocrine glands secrete hormones that are then picked up by the bloodstream and carried throughout the body Adrenal glands, thyroid glands, pituitary glands Connective Tissue Connective tissue connects the structures of the body it binds, supports, and anchors the body It is the most abundant type of tissue in the body Soft connective tissue examples include parts of our skin, tendons, and blood vessels it has a matrix composed of semi-fluid substance it has fibroblasts that secrete fibers, and white blood cells that fight infection
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8/18/2011 5 Connective Tissue Connective Tissue
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ireland3e_lecture_ch05 - 8/18/2011 Chapter 5 Tissues Tissue...

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