Tissue Part 2 (3) Flashcards
What does Epithelial Tissue do?
Lines, covers, and organizes your body, keeping your body from being just a pile of mushy goo.
Primary Epithelium
- First type of epithelial tissue
- Covers and lines your outer and inner body
- Skin (epidermis) and lining of body cavities
Glandular Epithelium
- Second type of epithelial tissue
- Forms your glands and secretes hormones & other substances
Your epithelium is avascular. What does that mean?
It doesn’t have its own blood supply!
What’s the shape of a SQUAMOUS cell and what does it do?
- It’s flat like a scale
- Transports things like oxygen or nutrients
- Found in places like lungs and blood vessels
What’s the shape of a CUBOIDAL cell and what does it do?
- It’s cube-like
- Little factory to produce things, like mucus
What’s the shape of a COLUMNAR cell and what does it do?
- It’s column-shaped
- Little factory to produce things, like mucus
What cell is “cheapest” to make and replace? (Hint: the size and shape is important)
Squamous cell! It takes less energy to make because it’s compact.
If a tissue’s “last name” is the shape of its cells, what is its “first name”? What do these two things help us figure out?
- First name: type of layering (simple or stratified)
- Helps figure out what the tissue does
Epithelial cells are polar. What does this mean?
- They have two sides:
- Apical (top - facing out)
- Basal (bottom - facing in)
Epithelial cells are selectively permeable. What does this mean?
- Keeps things separate BUT
- Also allows for some absorption, filtration, and excretion of substances
- Examples: intestines, kidneys, lungs
Glandular tissue forms two types of glands…
- Endocrine (secretes hormones right into bloodstream or nearby cells)
- Exocrine (secretes juices into tubes that lead to a surface – skin, stomach, bladder, etc.)
