Classification of tissues

what are the major functions of epithelium in the body?

1. absorption - simple columnar of small intestine 2. secretion - glandular epithelium 3. protection - skin is stratified squamous

connective tissue

1. anchors, packages, and supports body organs 2. the most durable tissue type 3. abundant nonliving extracellular matrix 4. most widespread tissue in the body

epithelium

1. lines body cavities and covers the body's external surface 2. cells may absorb, secrete, and protect 3. synthesizes hormones

simple squamous

1. lung tissue, alveolar sacs 2. forms thin serous membranes 3. a single layer of flattened cells

what are the general characteristics of connective tissues?

1. mesenchyme origin 2. large extracellular matric 3. few cells and low cellularity 4. vascularity varies 5. several cell types may be present in one tissue 6. fibers located in the matrix

muscle

1. pumps blood, flushes urine out of the body, allows one to swing a bat 2. major function is to contract

where is ciliated epithelium found?

1. trachea: pseudostratified ciliated columnar 2. fallopian tube: ciliated simple columnar

nervous tissue

1. transmits electrochemical impulses 2. most involved in regulating and controlling body functions 3. synthesizes hormones 4. forms nerves and the brain

define tissue

a group of cells with a similar function and origin

describe the general characteristics of epithelial tissue

avascular innervated polarity high cellularity high regeneration basement membrane line/cover structures of body

keratinized stratified squamous

epidermis of the skin

how do the endocrine and exocrine differ in structure and function?

exocrine "exit" secretes substances into ducts that lead out of the body example: salivary, mammary, and seat glands endocrine "enter" secretes hormones into blood capillaries

what role does ciliated epithelium play?

involved in moving a substance across the apical (top) surface

transitional epithelium

lining of the bladder, peculiar cells that have the ability to slide over each other

non-keratinized squamous

lining of the esophagus

on what bases are epithelial tissues classified?

shape number of cell layers (1 is simple, 2+ is stratified)

how is the function of epithelium reflected in its arrangement?

simple epithelium is used in absorption/secretion stratified epithelium is used in protection

simple columnar

simple squamous

transitional epithelium is actually stratified squamous epithelium, but there is something special about it. how does it differ structurally from other stratified squamous epithelia?

the cells change shape to allow stretching, which are only in the bladder. transitional epithelium is classified as stratified squamous.

how does transitional epithelium reflect its function in the body?

the urinary bladder stretches until it is full

simple cuboidal

tubules of the kidney