Animal Tissues A Quick Introduction

Tissue Categories Def- Group of cells that work together to perform a specific function Categories Connective tissue Epithelial tissue Muscle tissue Nervous tissue

Connective tissue Composed of both cells and exogenous matrix material Usually holds other tissues together Includes osseous tissue (bone) and blood Displays a variety of appearances

Connective tissues

More Connective Tissues

Epithelial Tissue Covers surfaces and lines cavities Protect, secrete 3 major shapes Squamous- flat Cuboidal Columnar Major arrangements Simple Stratified Pseudostratified Basal membrane

Epithilial Tissue Types

Muscle Tissue Contractile tissue Contains protein fibers that mediate movement 3 major types Cardiac Skeletal Smooth

Cardiac Muscle Tissue Found only in the heart Striations Intercalated discs Branched arangement Automaticity

Skeletal Muscle Tissue Moves bones Striations Peripheral nuclei Elongated cells Parallel arrangment

Smooth Muscle Tissue Involuntary movement of soft tissues Non-striated Arteries Intestines Bladder Non-striated Spindle shaped

Nervous Tissue Neurons Glial cells display an action potential Elongated, 3 parts Dendrite, soma, axon Transmit impulses Glial cells Support neurons Some insulate neurons

Nervous tissue

Summary Tissues are groups of cells that work together to perform a specific function Tissues come in a wide variety of types Each type has characteristics that allow its identification The colors seen in tissue samples are artificial and due to the staining technique used. Identification must be made based on more consistent characteristics