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Shelby Genzmer

on 4 February 2014

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Transcript of Tissues

Epithelial Tissue
Location : Covers body surface, cover and line internal organs, compose glands.
Description : Lack blood vessels, tightly packed cells
Function : Protection, absorption, excretion
Simple Squamous Epithelium
Single layer of thin flattened cells. Tightly packed together, and their nuclei are usually broad and thin.
Simple Cuboidal Epithelium
Single layer of cube-shaped cells. Centrally located, spherical nuclei. Covers the ovaries and lines most of the kidney tubules and the ducts of certain glands. In the kidneys this tissue secretes, and absorbs.
Simple Columnar Epithelium
Longer than they are wide. Composed of a single layer of cells with elongated nuclei, located at about the same level near the basement membrane. Line the uterus, and portions of the digestive track, including the stomach, small, and large intestines.
Squamous = Thin flattened cells
Cuboidal = Cube-shaped
Simple = One layer
Stratified = Multiple layers
The tissue is thick which enables it to protect underlying tissue. It secretes digestive fluids, and absorbs nutrients from digested food.
Pseudostratified Columnar Epithelium
It appears to be stratified, but they are not. The nuclei lie at two or more levels in the row of cells.
Line the passages of the respiratory system. The mucus-covered lining are sticky and trap dust and microorganisms that enter with the air.
Stratified Squamous Epithelium
Tissue is relatively thick. Cells divide in the deeper layers, and the new layers push old ones farther out.
Form the outer layer of the skin.
Stratified Cuboidal Epithelium
Consists of two or three layers of cuboidal cells that form the lining of a lumen.
Lines the large ducts of the mammary glands, sweat glands, salivary glands, and pancreas.
Stratified Columnar Epithelium
Consists of several layers of cells. The basal layers consists of cuboidal cells.
Found in the male urethra and ductus deferens and in parts of the pharynx.
Transitional Epithelium
Forms the inner lining of the urinary bladder, and lines the ureters and the superior urethra.
Transitional Epithelium forms a barrier that helps prevent the contents of the urinary tract from diffusing back into the internal environment.
Glandular Epithelium
Composed of cells specialized to produce and secrete substances into ducts or into body fluids.
Open onto surfaces, such as the skin of the lining of the digestive tract
Connective Tissue
Location : Widely distributed throughout the body.
Description : Good Blood supply, cells are farther apart than epithelial cells
Function : Bind, support, protect, fill spaces, store fat, produce blood cells.
Most common type of fixed cell in connective tissue. Large star-shaped cells produce fibers by secreting proteins into the extracellular matrix of connective tissue.
Originates as white blood cells, and are almost as numerous as fibroblasts in some connective tissues. Specialized to carry on phagocytosis.
Mast Cell
Large, and widely distributed in connective tissues. They are near blood vessels. Release heparin, which promotes some of the reactions associated with inflammation and allergies.
Collagneous Fibers
Thick threads of the protein collagen. They are grouped in long, parallel bundles, and are flexible but only slightly elastic
Elastic Fibers
Composed of springlike protein called elastic. These fibers branch, forming complex networks. They are easily stretched or deformed. Common in body parts normally subjected to stretching such as vocal cords.
Reticular Fibers
Thin collagenous fibers. Highly branched and form delicate supporting networks in a variety of tissues, including those in the spleen.
Loose Connective Tissue
Areolar Tissue: Forms delicate thin membranes throughout the body. Mainly made up of fibroblasts, and are located some distance apart and are seperated by a gel-like ground substance that contains collagenous and elastic fibers.
Loose Connective Tissue 2
Adipose: Or fat, develops when certain cells store fat as droplets in their cytoplasm and enlarge. When cells become abundant, they crowd other cell types, they then form adipose tissue. They lie beneath the skin, in spaces between muscles around the kidneys, behind the eyeballs, surface of the heart, and around certain joints.
Reticular Connective Tissue
Composed of thin, collagenous fibers in a three-dimensional network. Helps provide the framework of certain internal organs, such as the liver and spleen.
Dense Connective Tissue
Consists of many closely packed, thick, collagenous fibers and a fine network of elastic fibers. It contains few cells, most of which are fibroblasts. They are very strong, enabling the tissue to withstand pulling forces. It binds body parts in the form of tendons, and ligaments.
A rigid connective tissue. Provides support, framework, and attachment, protects underlying tissues, and forms structural models for many developing bones.
Hyaline Cartilage
The most common type, has very fine collagenous fibers in its extracellular matrix. Found on the ends of bones, in many joints, in the soft part of the nose, and supporting rings on the respiratory system.
Elastic Cartilage
Dense network of elastic fibers and is more flexible than hyaline. Provides the framework for the external ears, and parts of the larynx.
A very tough tissue, has many collagenous fibers. It is a shock absorber for structures that are subjected to pressure.
Most rigid connective tissue. Its hardness is due to mineral salts. It supports the body structures. Protects vital parts in the cranial and thoracic cavities. Bone cells are called osteocytes, located in lacunae.
Transports substances, helps maintain stable internal environment. Found throughout the body within a closed system of blood vessels and heart chambers.
Muscle Tissue:
Voluntary movements of skeletal parts. Muscles are usually attached to bones. They are striated.
Smooth muscle Tissue
Involuntary movements of internal organs. Found in the walls of internal organs. This tissue is not striated.
Cardiac Muscle Tissue
Heart movement, heart muscle. This tissue is striated.
Nervous Tissue
Sensory reception and conduction of electrical impulses. Found in the brain, spinal cord, and nerves.
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