Tissues Flashcards
What is a tissue
A tissue is a collection of cells that perform a similar function
4 basic types of tissue
Epithelia
Connective
Nerve
Muscular tissue
Germ cell has how many layers
3
Layers of the germ cell
Ectoderm
Mesoderm
Endoderm
Internal layer of the germ cell
Endoderm
External layer of the germ cell
Ectoderm
Middle layer of germ cell
Mesoderm
Epithelia cells do what ?
Cover or line all body cavities and tubes
Epithelia cells form the functional unit of
The functional unit of secretory glands
Why are epithelia cells called glandular epithelia
They form the functional unit of secretory glands
Characteristics of epithelia tissues
They do not have blood vessels but they soak up nutrients from neighboring connective tissues
. They have lot of nerves
They are good at self regeneration
Closely attached (like the tiles on the ground) to one another, thus forming a protective barrier.
Functions of epithelia tissue
To protect the tissue that like beneath it from radiation, physical trauma, pathogens
— to provide sensations
— filter the kidney
— form secretory glands
Epithelia is classified into
2: according to thickness
According to shape
Classification of epithelia according to thickness
Simple— one cell layer
Stratified— more than one layer of cell
Classification of epithelia according to shape:
Squamous
Cuboidal
Columnar
The simplest epithelia
Is simple squamous
Location of simple squamous
Alveoli of lungs
Lining blood cavities
Lining blood vessels
Simple squamous has what type of nuclei
A disc shaped nuclei
Functions of simple squamous
Passive transport of gases and fluids
Simple cuboidal has what nucleus
Large spherical nucleus
Function of simple cuboidal
Secretion abs absorption
Location of simple cuboidal
Kidney tubules
Ovary surfaces
Secretory portions of glands
Simple columnar epithelia has 2 types
Ciliated columnar
Non ciliated columnar
Simple columnar has what nuclei
Oval nuclei
Functions of simple columnar
Absorbtion and secretion of mucus
Secretion of enzymes
Goblet cellls do what
Secrete mucus
Location of simple columnar
Digestive tract
Gall bladders
Stratified squamous epithelia functions
Protection
Location of stratified squamous epithelia
Oral cervix; oral cavity canal
Stratified squamous is found in areas of the body
That are subject to friction
Stratified cuboidal functions
Protection
Stratified cuboidal epithelia locations
Salivary glands
Sweat gland
Mammary gland
Stratified columnar epithelia functions
Protection
Stratified columnar location
It is rare in the body but found in small amount in males urethra
Pesudostratified columnar functions
Secretes mucus
Location of pseudostfatified
Lines of trachea