1. HISTOLOGY
THE STUDY OF TISSUES

2. Four Major TissueTypes
Epithelial Tissue
Muscle Tissue

3. …..more tissues….
Nervous Tissue

4. EPITHELIAL TISSUE Covers surfaces of body and forms glands
Very little matrix- mostly cells
Some types have one free surface and one attached surface (to a basement membrane)

5. FUNCTION: Protection Barrier Control of movement of substances
Secreting
absorption
PROTECT YOUR SKIN SO IT CAN PROTECT YOU!

7. TYPES OF EPITHELIUM: Simple Squamous(one layer)
Functions in diffusion, secretion, protection
Found in lungs and blood vessels

8. EPITHELIUM Simple cuboidal
Functions in active and passive transport and secretion
Found in kidney tubules, lungs, ovaries

9. EPITHELIUM Simple columnar
Functions in filtering air in lungs with cilia, secretion, and absorption
Location: glands. Lungs, stomach, intestines

10. EPITHELIUM Pseudostratified columnar
Functions in synthesis and secretion of mucus, movement of mucus
Location: linings of respiratory system

11. STRATIFIED EPITHELIUM
Stratified Squamous (many layers)
Functions: protects against abrasion, infection, and water loss
Found in: skin, mouth, respiratory tract, eyes

12. STRATIFIED EPITHELIUM
Stratified Cuboidal epithelium
Functions in: secretion, absorption, protection against infection
Found in: sweat gland and salivary gland ducts, ovaries

13. STRATIFIED EPITHELIUM
Stratified columnar epithelium
Functions in: protection and secretion
Found in: larynx, mammary gland ducts

14. TRANSITIONAL EPITHELIUM
Stratified cells appear cuboidal when tissue is relaxed and squamous when tissue is stretched.
Functions in: accommodate change of fluid volume in organs, protects against caustic urine.
Found in: urinary bladder, urethra, ureters