chapter 5 tissues

tissues

groups of similar cells with a common function

histology

study of tissues

four major types of tissues

epithelial, connective, muscle, nervous

epithelial tissue function

tissue that protects, secrets, absorbs, and excrets

epithelial tissue location 

covers the surface of the body, covers and lines internal organs, composes glands 

epithelial tissue characteristics

Lack blood vessels, cells readily divide, cells are tightly packed

connective tissue functions

tissue that binds, supports, protects, fill spaces, stores fat, and produces blood cells

connective tissue location

widely distributed throughout the body

connective tissue characteristics 

Mostly have good blood supply, cells are farther apart than epithelial cells, with extracellular matrix in between

nervous tissue functions

conduct impulses for coordination, regulation, integration, and sensory reception

nervous tissue locations

brain, spinal cord, nerves

nervous tissues characteristics

cells communicate with each other and other body parts

tight junctions 

membranes of adjacent cells that merge and fuse

located among cells that form linings (sheet-like layers)

blood-brain barrier

desmosomes

forms “spot welds” between cells

offer structural reinforcement

located among outer skin cells

gap junctions

tubular channels between cells

used by molecules to move between cells

located in cardiac muscles cells