1. Tissue Types
Tissue refers to a group of cells that work together in the body.
The cells of a tissue share:
An embryonic origin.
Morphological features.
Arranged in an orderly pattern to perform their function.
Four broad categories of tissues: epithelial, connective, muscle, and nervous.
The cell types are characterized by specific functions that contribute to the overall health and maintenance of the body.
A disruption of the structure of a tissue is a sign of injury or disease.
Histology - the microscopic study of tissue appearance, organization, and function.

2. Embryonic origin
The zygote, or fertilized egg, is a single cell formed by the fusion of an egg and sperm.
After fertilization the zygote goes through many rapid mitotic cycles, forming an embryo.
The first embryonic cells are totipotent meaning they have the ability to differentiate into any type of cell in the body.
There are three major cell lineages established within the embryo.
Each forms the distinct germ layers from which all the tissues and organs of the human body eventually form.
Three germ layers identified by their relative position: 
ectoderm (ecto- = “outer”)
mesoderm (meso- = “middle”)
endoderm (endo- = “inner”). 

3. Four Types of Tissue
Epithelial tissue (epithelium) - sheets of cells that cover exterior surfaces of the body, lines internal cavities and passageways, and forms certain glands.
Connective tissue - binds the cells and organs of the body together and functions in the protection, support, and integration of all parts of the body. 
Muscle tissue - excitable, responding to stimulation and contracting to provide movement. Three major types: skeletal (voluntary) muscle, smooth muscle, and cardiac muscle in the heart. 
Nervous tissue - excitable, allowing the propagation of electrochemical signals in the form of nerve impulses that communicate between different regions of the body.

4. Epithelial tissue simple = single layer stratified = multiple layers
*Naming is based on description*
simple = single layer
stratified = multiple layers
squamous = flat
cuboidal = square
columnar = column (rectangle)
The cells are arranged in different forms, each form has a different function.

5. Simple Squamous Form: Flat and thin
Tissue
Form: Flat and thin
Function: diffusion and filtration. Air sacs in lungs, capillaries

6. Stratified Squamous Multi layer squamous, functions in protection
Found lining body cavities; skin and mouth

7. Simple Cuboidal Function: Secretion and absorption
Found in kidneys tubules, ducts and covering the ovaries

8. Simple Columnar Function: Secretion and absorption
Found in digestive tract and uterus
*Contains scattered goblet cells to secrete mucus
*Can have microvilli

9. Pseudostratified Columnar
Appear stratified, but just a single layer of cells, nuclei at different levels
Can have cilia (hair-like projections)
And goblet cells, which secrete mucus
Function: Secretion and cilia-aided movement
Location: lining air passages and tubes of the reproductive system

10. Transitional Epithelium
Stretchable
Blocks diffusion (no leaking)
Found in the urinary bladder

11. Glandular Epithelium Cells are specialized to secrete substances
They make up the GLANDS
                     exocrine glands         endocrine glands
   Examples:    salivary, sweat            hormones

12. Loose Connective Tissue
Binds underlying organs to skin and to each other
Forms delicate thin membranes throughout the body

13. Adipose Tissue (fat)
Energy Storage

14. Fibrous Connective Tissue
Tendons =  muscles to bones
Ligaments = bones to bones

15. Hyaline Cartilage
Location: covers ends of joints, nose and respiratory passages, serves as padding

16. Elastic cartilage
Location: External Ear and Larynx

17. Fibrocartilage
Tough, shock absorbing Location: Between vertebrae

18. Bone Tissue (Osseus)

19. Blood Tissue

20. Cardiac muscle

21. Skeletal muscle (striated)

22. Smooth muscle

23. Nerve Tissue

24. organs
Several types of tissues come together to form a working unit, an organ.
Knowledge of tissues will help you understand how organs function.