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Bio201

Tissues and Integumentary System

tissue a group of similar cells with a common function
histology study of tissues
4 major types of tissues in the body Epithelial tissue, Connective tissue, Muscle tissue, Nervous tissue
characteristics of epithelial tissue -function: Protection, secretion, absorption, excretion -location: Cover body surface, cover and line internal organs, compose glands -characteristics: lack blood vessels, cells readily divide, cells are tightly packed
characteristics of connective tissue -function: Bind, support, protect, fill spaces, store fat, produce blood cells -location: Widely distributed throughout the body -characteristics: have good blood supply, cells are farther than epithelial cells, extracellular matrix in between
characteristics of muscle tissue -function: movement -location: attached to bones, in the walls of hollow internal organs, heart -characteristics: able to contract in response to specific stimuli
characteristics of nervous tissue -function: Conduct impulses for coordination, regulation, integration, and sensory reception -location: Brain, spinal cord, nerves -characteristics: cells communicate with each other and other body parts
3 types of Intercellular Junctions tight junctions, desmosomes, gap junction
tight junctions close space between cells by fusing cell membranes -ex: cells that line the small intestine
desmosomes bind cells by forming “spot welds” between cell membranes -ex: cells of the outer skin layer
gap junction form tubular channels between cells that allow exchange of substances -ex: muscle cells of the heart and digestive tract
general characteristics of Epithelial tissues -Cover organs and body surface -Line cavities and hollow organs -Make up glands -Have a free surface on outside, and basement membrane on inside -Lack blood vessels (avascular), and nutrients diffuse to epithelial tissue from underlying connective ti
Created by: lacim05
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