why is it important to maintain epithelial polarity?

What would happen if you placed a red blood cell in distilled water?

Consider this question: Muscles are responsible for what % of the body's heat production?

Consider this question:What role do calcium ions and ATP play in muscle contraction

Ok guys.. give the above question a go!!

receptor meditated endocytosis

hey just a question for anyone who knows the answer :D because i am unsure myself

Q. Receptor meditated endocytosis & exocytosis - does this apply for all types of endo and exo processes or just TRANSCYTOSIS (the transport of a substance across a cell)

thank you
vivian

Tuesdays test..

hey, so i just have a fw clarification questions regarding the revision questions we were given. with Question 7 " describe the criteria used to classify covering and lining epithelia" im not really sure what this is asking about, is it just referring to the types of epithelial cells such as the squamous, cuboidal , stratified etc or is it asking someting else.

Question 9. " what cells are found in ET and what is the function of each? apply this to the oral cavity" i was just wodnering whta owuldbe expected fromthis question, so i would discuss something like there are the squamous, cuboidal, columnar which ach have a funcion of protection, secretion and absorption respectively.. but im once again not sure if that is what is wanted

And also.. I know how bone gets its blood supply, through the cannaliculi etc but im not sure.. does that mean bone is classed as vascular??

OK i think that is all for now.. Im sure i wil have more later. :P
thanks for any help..
Also if ne one wants to do some study tomorrow morning before the lectures let me know coz i will be going in early n would love some company. :D
happy studying.

Questions about Test

Hi Sophie,

I just have a few questions re: info that we need to know for the test.

1. What is the difference between pseudostratified columnar and simple columnar?
Is it just that pseudostratified columnar have cells of different heights or is there more to it?

2. Does repolarisation need ATP as well as K+ for gated channels?

3. Does all connective tissue have some sort of blood supply even if it is small? Does catilage have a blood supply?

4. Do we need to know about fibroblasts, osteoblasts, chondroblasts and heatopoietic stem cells that make up different CT or do we just need to know they exist?

Hope your having a good weekend!!
Thanks,

Beth