Lecture 2: Tissue Types Flashcards
What are the 4 tissue types?
Epithelium
Connective Tissue
Muscle
Nerve
Which type of tissue is considered the bodyguards of the body?
Epithelium
How does Epithelium act as a body guard?
They determine what comes in and what comes out of the body
What are some examples of where Epithelial tissue is present?
Surround blood vessels
Every organ has epithelium to determine what comes in and out
It also lines cavities
Covers every exposed body parts
What kind of tissue is every gland in the body made of?
Epithelial tissue
What is the caveat of Epithelial tissue?
It has no way to support itself and no way to remove its waste
How does Epithelial tissue support itself?
It will always be associated with a connective tissue
What is the main functions of Epithelium?
- Forms barriers between the inside and outside world
- Forms barriers between compartments in the body
- Covers exposed body surfaces
- Lines hollow organs, body cavities and tubes and glands
- Forms all glands in the body
Which tissue forms barriers between the inside and outside world?
Epithelium
Which tissue separates compartments within the body?
Epithelium
What does Epithelium line?
Hollow organs, body cavities and tubes of glands
What are the functions of Connective tissue?
- Links tissues and organs together
- Provides structural and metabolic support
- Stores energy
- Forms the immune system
Which tissue links tissues and organs together?
Connective tissue
Which tissue provides structural and metabolic support?
Connective tissue
Which tissue type stores energy?
Connective
Which tissue forms the immune system?
Connective
What type of tissue is under the layer of epithelium in the skin?
Connective tissue
What additional type of tissue is present whenever there is epithelial tissue?
Connective tissue
Which kind of tissue is the lymphatic system made of?
Connective
What kind of tissue is the immune system?
Connective
What is the main way that connective tissue stores energy?
In fat
What is Muscle tissue specialized for?
Contraction
What does Muscle tissue generate force to?
- Produce motion of body parts
* Move substances through blood vessels and hollow organs
What does Muscle tissue do in relation to temperature?
It maintains body temperature
What is the function of Nervous tissue?
- Receives, process and integrates signals from within the body and from external environment
- Generates and transmits impulses that control and integrate the various function of the body
What does Epithelia look like?
A bunch of cells that are nicely stacked up and are linked super tightly
What is the Vascularity of Epithelia?
It is avascular but has many nerves
What are the two surfaces of Epithelia?
Apical and Basal
What is the Apical surface of Epithelia?
The surface that faces the cavity of whatever it lines
What is the Basal surface of Epithelia?
The surface of epithelial cells that faces the base
What is the Basal surface associated with?
The extracellular matrix or ECM
What forms the Basement membrane?
The ECM from epithelium and the ECM from connective tissue that bind together
How much ECM is there with Epithelia?
Epithelia doesn’t have much extracellular matrix, only the Basement membrane
What does it mean for Epithelia to be polarized?
The apical and basal surfaces will both have separate functions
What is the rate of regeneration of Epithelial cells?
They have a very high rate of regeneration
What are the characteristics of Epithelium?
- Continuous
- Avascular but richly innervated
- Rests on Basal Lamina
- Polarized
- High regeneration
What are the different functions that Epithelia serves?
- Absorption
- Permeability
- Secretion
- Sensation
- Protection
What are the two ways Epithelia is classified?
- Number of layers of cells
* Shape of cells in outermost (apical) layer
What are the types of Epithelial tissue?
- Simple squamous epithelium
- Simple cuboidal
- Simple columnar
- Pseudostratified columnar
- Stratified squamous
- Stratified cuboidal
- Stratified columnar
- Transitional
What are the physical characteristics of Simple Squamous epithelium?
- Single layer of flat cells
* Irregular shape
What does Simple Squamous Epithelium line?
- Body cavities
- Heart chambers and blood vessels
- Sites of gas exchange in lungs
What does the single layer of Simple Squamous epithelium allow for?
Things to pass through very easily
What does Simple Squamous epithelium secrete?
Serous fluid
What is the function of Serous fluid?
Reduces friction
What is Mesothelium?
The Simple Squamous epithelium that lines body cavities
What is Endothelium?
The Simple squamous epithelium that lines the heart chambers
Which type of Epithelial tissue controls vessel permeability?
Simple Squamous epithelium
What are the physical characteristics of Simple Cuboidal epithelium?
- Single layer of cells
* Cell height equals cell with
Where is Simple Cuboidal epithelium found?
- In glands and their ducts
* Lining portions of the kidney
What are the main functions of Simple Cuboidal epithelium?
Secretion and absorption
What are the physical characteristics of Simple Columnar epithelium?
- Single layer of cells
* Cells taller than they are wide
What does Simple Columnar epithelium line?
The digestive tract
What is the function of Simple Columnar epithelium?
- Absorption and protection in the digestive tract
* Secrete mucus and enzymes
What are the physical characteristics of Pseudostratified columnar epithelium?
- 1 layer thick
- All cells touch the basal lamina but not all may reach the apical surface
- The ones that reach the top have cilia
Where is Pseudostratified columnar epithelium found?
In the respiratory system
What do the Cilia on Pseudostratified columnar epithelium do?
The ones on the top have projections to move things along like mucus and the ones below produce mucus
What are the physical characteristics of Stratified Squamous epithelium?
- Stratified cells
- Outermost layer is squamous
- Many layers
Where is Stratified Squamous Epithelium found?
Where mechanical stresses are severe
•Outer layer of skin
•Oral cavity, esophagus, anus, vagina
Where is Keratin found?
It is found in the skin