3-Tissues - Tissues Tissues are collection of structurally...

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Click to edit Master subtitle style Tissues Tissues are collection of structurally similar cells with related function. The entire body is composed of only four major types of tissues. 1. Muscle 2. Nervous 3. Epithelial 4. Connective tissues Groupings of these four primary tissues into anatomical and functional units are called organs. Organs in turn, may be grouped together by common functions into systems.
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Click to edit Master subtitle style Muscle Tissue Muscle is contractile tissue of the body and is derived from the mesodermal layer of embryonic germ cells. It is classified as skeletal, cardiac, or smooth muscle, and its function is to produce force and cause motion, either locomotion or movement within internal organs. Skeletal muscle is a type of striated muscle, usually attached to the skeleton. Skeletal muscles are used to create movement, by applying force to bones and joints; via contraction. Smooth muscle is found within the walls of organs and structures such as the esophagus, stomach, intestines, bronchi, uterus, urethra, bladder, and blood vessels, and unlike skeletal muscle, smooth muscle is not under conscious control. Cardiac muscle is also an "involuntary muscle" but is a specialized kind of muscle found only within the heart.
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Click to edit Master subtitle style Muscle Tissue
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Click to edit Master subtitle style Nervous tissue Nervous tissue is specialized to: react to stimuli and to conduct impulses to various organs in the body which bring about a response to the stimulus . Nerve tissue (as in the brain, spinal cord and peripheral nerves that branch throughout the body) are all made up of specialized nerve cells called neurons . Neurons are easily stimulated and transmit impulses very rapidly .
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Click to edit Master subtitle style A nerve is made up of many nerve cell fibers (neurons) bound together by connective tissue. A sheath of dense connective tissue, the epineurium surrounds the nerve. This sheath penetrates the nerve to form the perineurium which surrounds bundles of nerve fibers. blood vessels of various sizes can be seen in the epineurium. The endoneurium , which consists of a thin layer of loose connective tissue, surrounds the individual nerve fibers.
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Click to edit Master subtitle style Functions of Epithelial Tissue 1. Protection: Epithelial cells from the skin protect underlying tissue from mechanical injury, harmful chemicals, invading bacteria and from excessive loss of water . 2. Sensation Sensory stimuli: penetrate specialized epithelial cells . Specialized epithelial tissue containing sensory nerve endings is found in the skin, eyes, ears, nose and on the tongue. 3. Secretion In glands:
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This note was uploaded on 11/16/2009 for the course PCB 3703C taught by Professor Morgan during the Fall '07 term at University of Central Florida.

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3-Tissues - Tissues Tissues are collection of structurally...

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