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Simple squamous epithelium
- "chain like fence" single layer flat cells
- Function: diffusion
- Location: inner lining of circulatory system and small sacs of the lungs (aveoli)
Simple cuboidal epithelum
- single layer cube shaped cells.
- Function: SECRETION and absorption.
- Location: glands of the body (e.g. ovaries, salivary glands, pancreas).
Simple Columnar Epithelium
- Single layer column shaped cells.
- Function: secretion and ABSORPTION. Bringing molecules into cells.
- Location: Digestive tract (stomach --->anal canal).
Pseudostratified columnar epithelium
- pseudo= false (fake)
- structure: single layer of cells of varying heights.
- Function: secretion (of mucus)
- Location:Upper respiratory tract
- Cover the body surface.
- As covering and lining tissue.
- Always found as a surface tissue.
- Between organs and tissues.
- Few cells with lots of extracellular material.
- 4 Types: Blood, bone, cartilage and general connective tissue.
- Highly specialized to contract (shorten) and generate force.
- Skeletal muscles of the body and many body organs.
- Heart and other internal organs.
- 3 types: skeletal, smooth, cardiac
- transmission of electrical signals, which relay information from one part of the body to another.
- Specialized for conduction of electrical signals.
- Brain, spinal cord, and nerves.
"squashed" flat cells
cube shaped cells
Column shaped cells
multiple cell layers
Stratified Epithelial Tissues
- skin "brick wall"
- Multiple layers of flat cells (squashed cells)
- Functions: protection against abrasion
- Location: outer layer of the skin, mouth -->esophagus
Stratified columnar epithelium
Structure: Multiple layers of column-shaped cell
Transitional (stratified cuboidal) epithelium
- Structure: "transitions" between being 6 <-->3 cell layers thick
- Function: designed to stretch
- Location: Urinary bladder
Soft Connective Tissues
Blood, Bone, Cartilage, General connective tissues
- is made up of 2 basic building blocks: cells and ECM (extracellular matrix)
- All connective tissues have a lower % of cells than ECM (less cells more ECM)
- Many connective tissues have a rich nerve and blood supply. (cartilage is an exception; its avascular and lacks nerves).
- connective tissue proper
- adipose tissue
- reticular tissue
Cartilage (skeletal support tissue)
Firm to rubbery connective tissue
Bone (skeletal support tissue)
Hard connective tissue
Blood(unique connective tissue)
Fluid connective tissue
stationary cells of CT proper
Produce fibers either collagen or elastic fibers
store lipid (energy reserves)
Ground Substance (interfibrillar substance)
gives great tensile strength
Elastic fibers (elastin)
Elastic-able to readily stretch and recoil
General Connective Tissues
5 types: Loose connective tissue, dense irregular, dense regular, elastic, adipose
Connective tissue proper
collagenous connective tissue
Loose connective tissue (areolar)
- Structure: small amount of collagen (even less elastin)
- Distribution: attaches epithelium, surrounds vessels, neurons, muscle fibers
- Function: creates space for passage of vessels and nerves.
Dense irregular connective tissue
- most important. Everywhere in body.
- structure: LOTS of collagen in many directions (packed within tissue)
- Distribution: Dermis, sclera (outer layer of eye)
- Function: strength in ALL directions.
Dense regular connective tissue
- Structure: LOTS of collagen in one direction
- Distribution: Tendons and ligaments
- Function: Strength in ONE direction.
Elastic Connective Tissues
- Structure: LOTS of Elastin
- Distribution: Found in skin, lungs, arteries, veins
- Function: Can stretch and recoil
- Structure: LOTS of adipose cells
- Distribution: Beneath skin, around organs, in bone morrow.
- Function: Energy storage, insulation, cushion and protect.