TISSUES: The Living Fabric Tissue - a group cells similar in structure and function Histology - the study of tissues

EMBRYONIC GERM LAYERS Ectoderm - epidermis of the skin,nervous system Endoderm - functional lining of the digestive, respiratory tract; accessory organs and glands such as lungs, stomach,pancreas Mesoderm - skeletal system, muscular system, and circulatory system

MAIN TISSUE TYPES Epithelial Connective Muscle Nervous

Epithelial Tissue

EPITHELIAL TISSUE Location –Any lining or covering of the body –Forms may glands Characteristics –Cellularity –Specialized contact structures –Polarity –Supported by connective tissue –Avascular yet innervated –Regeneration

EPITHELIAL TISSUE FUNCTIONS: –Protection –Absorption –Filtration –Secretion –Gas exchange

EPITHELIAL TISSUE CLASSIFICATION

EPITHELIAL TISSUE

Glandular Epithelium –Endocrine –Exocrine Merocrine Holocrine Apocrine ???

Connective Tissue

CONNECTIVE TISSUE Location –Throughout body –Most abundant type Characteristics –Common origin –Diverse cell types –Diverse vascularity –Possess extracellular matrix –No free surfaces

ORIGIN OF CONNECTIVE TISSUES

CONNECTIVE TISSUE Functions: –Physical protection –Binding and supporting –Absorb shock –Insulation –Stores energy –Transportation –Immunity

CONNECTIVE TISSUE FIVE GENERAL TYPES –Loose connective tissue –Dense connective tissue –Cartilage –Osseous –Blood

Loose Connective Tissues Areolar Adipose Reticular

CONNECTIVE TISSUE

Dense Connective Tissue Dense Regular Dense Irregular Elastic

CONNECTIVE TISSUE

CARTILAGE Hyaline Elastic Fibrocartilage

CONNECTIVE TISSUE

Osseous Tissue Compact bone Spongy bone

CONNECTIVE TISSUE

Blood

CONNECTIVE TISSUE

Nervous Tissue

Locations : –Central nervous system (CNS) –Peripheral nervous system (PNS) Functions: –Detects changes in internal and external environment –Receives, transmits, and integrates impulses –Homeostasis

NERVOUS TISSUE

Muscle Tissue

Locations: –Attached to bones –Walls of digestive organs and blood vessels –Walls of heart Functions: –Locomotion –Movement of food through digestive tract –Movement of blood throughout circulation

MUSCLE TISSUE

MEMBRANES