simplified definition of an epithelial tissue
lines and covers surfaces
simplified def. of a connective tissue
protect,support, and bind together
simplified def.of a muscle tissue
produces movement
simplified def. of a nervous tissue
recieve stimuli and conduct impulses
describr epithelial tissue
Lining or a covering. covers all free body surfaces, covers and lines all organs has no blood supply, Avascular Anchored by a basement membrane classified by shape and number of cell layers functions are protection,absorbtion,diffusion,secretion and lubrication
what structure does epithelial cells do not cover
ends of bones
name and describe the 3 types of cell layers
simple- 1 layer striated- multiple layers pseudostriated- cells that appeared to be striated but are not
name the the different shapes of tissue
Squamas Cuboidal Columnar
describe squamas cells
flat, leaf-like cells(fried egg shaped) -one layer leaf like cells -found in lungs,lining blood vessels, eardrum Function: diffusion and filtration
describe cuboidal tissues
-cube shaped, has shape and depth(central nucleus) -one layer of cuboidal cells -found in ducts,tubules of the kidneys,opening on the inside of the tube called the lumen -also found on the surface of ovaries and ducts of some glands
describe Columnar tissues
-long tall column like cells(nucleus closer to basement membrane, usually in a stragiht line) -one layer of column like cells -white goblet cell(mucous producing cell) w/in columnar cells Function: Absorbtion Found in digestive system, portion of respiratory tract
describe pseudostratified epithelial
-cells appeared to be stratified bu actually aren’t,NOTE nuclei tha tare at diff. level -NOTE the brush border of cilia along the top of the cells -found mainly in respiratory tract, cilia used for devris out of lungs
describe Transitional Epithelium
-squamous cells that must stretch and shrink -appears stratified when relaxed -found specifically in the urinary bladder
describe connective tissue
-most abundant tissue in the body -a connective tissue consists of “cells in a Matrix” Functions: connects, supports,frames,fills spaces,stores fat,makes blood cells
matrix
composed of fibers and a ground substance. The ground substance can be fluid, gel-like, or solid. Fibers are elastic,collagen, or reticular Functions: Connect,supports,frames,fills spaces, stores fat,makes blood cells
name the cell 3 types
Fibroblast Mast cells macrophage
fibroblast
large star shaped cell which produces intercellular matrix. This matrix is mostly the protein collagen
Mast cells
found near blood vessels,aid in inflammatory response and prevent blood clots
macrophage
phagocyte attached to fibroblasts -a phagocyte is a cell capable of gulfing bacteria and other loose particles
name the 3 types of connective tissue
areolar adipose dense connective
what type of tissue contains loosely woven fibers and is flexible?
loose connective tissue
Areolar tissue
-found in the hypodermis -contains loosely woven elastic and collagen fibers
adipose tissue
-functions in fat storage -cells in adipose have very little matrix between them -the cells contain a large amount of fat that pushes all cells organelles to the edge of the cell
dense connective tissue
contains closely packed fibers -dense regular connective tissue -tendons and ligaments -dense irregular connective tissue -found in the dermis of the skin. Fibers are irregularly arranged
tendons connect ____to____ ligaments connects _____to____
tendons connect muscle to bone ligaments connect bone to bone
describe blood cells
note the RBC. they have a white center where the nucleus was removed the white blood cells with the multi-lobed nuclei
Bone cells
note the osteons that look like key rings
osteocytes- (inside their lacuna) are at the center of each osteon
describe cartilage
chondrocytes within their lunca
intercellular matrix here is a hard gel like substance
describe adipose cells
contain mostly fat with their nuclei pushed to the edgesof each cell
very little intercellular matrix
describe muscle tissue
used to produce movement
smooth-found in walls of hollow organs, such as digestive system,respiratory tract
cardiac- found in heart, involuntary muscle
skeletal- found attached to skeleton. voluntary movement
name the 3 types of cells that fall under muscle tissue
cardiac
smooth
skeletal
describe nuervous tissue(simplified)
nervous tissue used for impulse conduction
found in brain, spinal cord, nerves
glial cells support helper cells for the neuron