This summary Human Biology includes books, slides and lecture notes. Titles are clearly marked in color, and expressed figures are all included. The text is written in English. Good luck, it worked for me ;-)!
… and NUMBER OF LAYERS :
• Simple/single-layered epitheleum : molecules can pass through easily => diffusion across cell barriers. Glands +
respiratory-digestive-reproductive systems
• Stratified/multiple-layered epitheleum : Provides protection for underlying cells (e.g. the skin surface)
The BASEMENT MEMBRANE provides structural support
Basement membrane = a supporting noncellar layer directly beneath the cell of an epithelial tissue (and beneath that
one, is a layer of connective tissue – see later) => Anchors the epithelial cells to the strong connective tissue below.
Consists proteins secreted by the epithelial cells & by underlying connective tissue layer. (is NOT plasma membrane =
part of living cell!!)
Epithelial cells may also be connected to eachother in 3 types of junctions made up by different PROTEINS :
Tight junctions : seal plasma membranes of adjecent cells so tightly that nothing can pass => controls movement
of substances in/out our body (digestive tract, bladder, tubules kidneys)
Adhesion junctions : “spot demosomes”, looser. Tissues can strectch & bend (skin)
Gap junctions : Connecting channels for movement of water & ions between adjacent cells. (liver, heart, muscles).
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller IsoldeLas. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $3.24. You're not tied to anything after your purchase.
