100% satisfaction guarantee Immediately available after payment Both online and in PDF No strings attached
logo-home
PYC2605 Exam Study & Revision Pack R200,00   Add to cart

Exam (elaborations)

PYC2605 Exam Study & Revision Pack

1 review
 85 views  2 purchases

These are Exam questions and solutions (INCLUDING STUDY NOTES) just as those that were found in assignments, study guides and practice questions. When you work through these you will gain an excellent understanding of concepts, theories, techniques and methods which will allow you to answer exam q...

[Show more]

Preview 4 out of 479  pages

  • January 27, 2021
  • 479
  • 2020/2021
  • Exam (elaborations)
  • Questions & answers
All documents for this subject (47)

1  review

review-writer-avatar

By: Annalisa01 • 3 year ago

avatar-seller
ivann
MODULE : PYC2605

,PYC2605 Exam
Study Revision
Pack
Contains:

• Exam Questions & Solutions
• (2011 – 2019)
• Exam Papers Included
• Questions & Solutions
• Detailed Study Notes

, Stuvia.com - The study-notes marketplace


1



CHAPTER 1

HIV AND THE IMMUNE SYSTEM



AIDS = Acquired Immune Deficiency Syndrome



1. HISTORY
1. 1981
2. 1983 virus induced
3. 1986 HIV
4. HIV1 – Central, East southern Africa; North and South America, Europe, rest of world.
5. HIV2 – West Africa 1986; Not so pathogenic
6. HIV1 – 1983 – Dr Luc Montagnier fm Louis Pasteur Institute Parks
1984 – Dr Robert Gallo – USA – a) Propogate virus in cell structure
b) Dev. 1st diagnostic test 4 HIV



2. WHAT IS A VIRUS?
1. Pathogen
2. Smallest
3. Parasitic
4. Genes with master code
5. DNA core
6. HIV = RNA
7. 2 Main parts = Core = DNA/RNA
Capsule = protects core
Proteins, projections (spikes)
rd
8. HIV has 3 part = lipid envelope
9. Viruses only attack specific cells
10. Antibodies attach to out protein of virus = shield
11. HIV identified by cone shaped core
12. Main protein of HIV p24
13. HIV Hijacks CD4 cells, immune defence cells.



3. THE FUNCTIONING OF A HEALTHY IMMUNE SYSTEM
1. Non-Specific - Barriers (Skin)
Inflammatory reaction
Protective proteins (attract phagocytes, devour microbes)

2. Specific - T Lymphocyte – CD4 enhance others response
Suppressor T Lymphocytes – CD8 proteins
Killer T Lymphocytes (Cytotoxic T Lymphocytes) – directly binds with enemy
Downloaded by: peggylberge | peggylberge@gmail.com
Memory T Lymphocytes
Distribution of this document is illegal

, Stuvia.com - The study-notes marketplace


2

B Lymphocytes – Plasma B Lymphocytes (produce antibodies)
Memory B Lymphocytes
Work on T cell command.

3. Soldiers – 3 Regiments
a. Phagocytes
b. T Lymphocytes
c. B Lymphocytes



4. Four phases
1. Enemy recognised – battle begins
a) Phagocytes = spies
b) Can’t kill organic enemy
c) Call Macrophages which mobilise lymphocytes
d) By capturing enemy antigen and displaying it
e) Antigen alerts T lymphocytes
f) T Lymphocytes (CD4) recognise antigen and with
macrophage go to next phase



2. The Forces multiply
a) CD4 multiply
b) Activate more phagocytes
c) Send chemical message to T and B Lymphocytes to
make antibodies



3. Attack and Victory
a) T cells – Killer T inject infected cells and contents
spill out
b) Antibodies attach to cell
c) Slows virus and phagocytes/macrophages consume
them
d) Antibodies kill with chemicals



4. Cessation of Hostility and Recording of Information
a) Suppressor T Cells tell B cells to stop
b) Memory T & B Cells remember antigen




Downloaded by: peggylberge | peggylberge@gmail.com
Distribution of this document is illegal

The benefits of buying summaries with Stuvia:

Guaranteed quality through customer reviews

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

Quick and easy check-out

You can quickly pay through EFT, credit card or Stuvia-credit for the summaries. There is no membership needed.

Focus on what matters

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 this summary from?

Stuvia is a marketplace, so you are not buying this document from us, but from seller ivann. Stuvia facilitates payment to the seller.

Will I be stuck with a subscription?

No, you only buy this summary for R200,00. You're not tied to anything after your purchase.

Can Stuvia be trusted?

4.6 stars on Google & Trustpilot (+1000 reviews)

72042 documents were sold in the last 30 days

Founded in 2010, the go-to place to buy summaries for 14 years now

Start selling
R200,00  2x  sold
  • (1)
  Buy now