100% satisfaction guarantee Immediately available after payment Both online and in PDF No strings attached
logo-home
CONCISE A/A* AS Biology Blood Vessels and Tissue Fluid complete revision notes (new spec) + Exam Questions and mark schemes £2.99
Add to cart

Other

CONCISE A/A* AS Biology Blood Vessels and Tissue Fluid complete revision notes (new spec) + Exam Questions and mark schemes

 1 purchase

I have condensed the entire A Level Biology AQA Blood Vessels and Tissue Fluid topic into an easy to read, concise booklet. These notes make one of the hardest A level biology topics so much easier to understand and help to provide exactly what the examiner is actually looking for. These notes ...

[Show more]

Preview 1 out of 9  pages

  • September 28, 2022
  • 9
  • 2022/2023
  • Other
  • Unknown
All documents for this subject (187)
avatar-seller
hannahresources
Blood Vessels and Tissue fluid
Circulatory System and Blood Vessels

Mass Flow/Mass transport

the bulk movement of substances down a pressure gradient.

A circulatory system is an example of mass transport as large amounts of substances are moved
from a high pressure to a low pressure.

Diffusion of for example oxygen from the gas exchange surface of the alveoli to all the respiring
tissues would be too slow to meet metabolic requirements (i.e. the rate of respiration required to
release enough energy) as the diffusion pathways are too slow and diffusion only moves small
numbers of molecules.

Role of the heart

to create the pressure gradient for the flow to occur. Ventricular contraction creates a high
pressure and blood returns into the relaxed atria that have a low pressure.



Structure and Adaptations of Blood Vessels
Arteries

Arteries transport blood away from the heart

Ventricular contraction creates a high pressure, so the arteries have thick walls to withstand the
pressure

The wall has a greater proportion of elastic tissue compared to muscle tissue

When ventricular contraction (systole) occurs, the blood enters the arteries under high pressure

So the elastic tissue stretches leading to smoothing out of the surge in blood pressure

When the ventricles relax the blood pressure falls and the elastic tissue recoils

This maintains the blood pressure and flow of the blood

The endothelial tissue lining the blood vessel gives a smooth surface reducing friction and giving
less resistance to flow

It also prevents blood from being trapped and therefore prevents blood clotting

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 credit card 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 these notes from?

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

Will I be stuck with a subscription?

No, you only buy these notes for £2.99. You're not tied to anything after your purchase.

Can Stuvia be trusted?

4.6 stars on Google & Trustpilot (+1000 reviews)

69252 documents were sold in the last 30 days

Founded in 2010, the go-to place to buy revision notes and other study material for 15 years now

Start selling
£2.99  1x  sold
  • (0)
Add to cart
Added