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Tissue Levels (Ch 4)

Tissue Levels of Organization (Anatomy/Physiology)

small, fingerlike extensions of the exposed cell of an epithelial cell microvilli
formed by the fusion of the outer layers of the cell membranes; it prevents the passage of water and solute between cells tight junctions
two cells are held toghether by embedded membrane proteins, they are channel proteins that form a narrow passageway that lets small molecules and ions pass from cell to cell gap junctions
cell membranes of two cellls are locked together by intercellular cement and by membrane proteins desmosomes
The matrix of cartilage consists of a firm gel and cells called chondrocytes
a collection of cells tissues
the study of tissues histology
this includes epithelia and glands epitheilal tissue
are layers of cells that cover internal or external surfaces epithelia
It is composed of secreting cells derived from epithelia glands
Where are epithelia found? It covers the skin,it linea internal passageway that communicate with the outside such as the digestive, repiratory, reproductive, and urinary, tracts
What are the functions of epithelia? (PSP'S) 1. Provides physical protection 2.conrols permeability 3.Provide sensation 4.produce Specialized Secretions
What are exocrine secretions? They secretions dischargedonto the surfacde of epithelium. Examples:Milk of mammary glands, perspiration on the skin, enzymes entering digestive tract
What are endocrine excretions? They are secrteions released into surrounding tissues and blood. These secretions are hormones that producesd in specific organs
What are some types of exocrine glands?
Created by: shardsofhope