test 2 Flashcards
what are tissues
are many cells ( and extracellular space) with similar structure and function working together
four main types of tissue
epithelial
connective
nervous
muscular
what is the main function of epithelial tissue
to cover almost all organs
why does epithelial tissue take on different forms
because different organs have different needs. different forms allow it to take on different functions
epithelial tissue has cells that are
packed closely together
what is an important thing that epithelial tissue shows
a polarity
what is a polarity for epithelial tissue
it always has an outer or top side called the apical side a lower or bottom side called the basal side
what is the basement membrane
where the epithelial tissue ends and the next layer of tissue begins
what are the three main shapes of epithelium
squamous, cuboidal, columnar
what are squamous epithelium
epithelium is short
what are cuboidal epithelium
epithelium is cubeshaped
what is columnar epithelium
epithelium is column shaped
what are the other ways epithelium can be sorted
simple, stratified, pseudostratified
what does simple epithelium look like
has just one layer of cells
what does stratified epithelium look like
has multiple layers of cells
what does pseudostratified epithelium look like
looks stratified , but isn’t
what should always look at to categorize squamous, cuboidal, etc
the most apical layer
2 other ways you can define epithelium
ciliated, glandular
what is ciliated epithelium
has cilia
what is cilia
hairlike or fingerlike projections that push things along the apical surface
what is glandular epithelium
epithelium that secretes some kind of fluid
two types of glandular epithelium
- exocrine epithelium
- endocrine epithelium
what is exocrine epithelium
secretes things towards outside of organ or duct, often has ducts
what is endocrine epithelium
secretes things into blood stream, has no ducts