Biology B3 - The Circulatory System and Blood

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  • Created by: RATM33
  • Created on: 24-12-09 16:10

The circulatory system

  1. The heart is a double pump – Arteries take blood away from the heart while veins take blood to the heart. The right (left as you look at the diagram, right in real life) takes deoxygenated blood to the heart, while the left takes oxygenated blood around the body.
  2. Arteries carry blood at high pressure
  3. As a rule arteries carry oxygenated blood while veins carry deoxygenated blood. However, the pulmonary vein and artery break this rule and carry the opposite type of blood.
  4. The arteries split off into thousands of tiny capillaries and take blood to every cell
  5. The veins transport the deoxygenated blood at low pressure back to the heart.


The heart is made to pump by little pulses of electricity from the wall of the right atrium

Blood Vessels


  • Carry blood away from the heart (always oxygenated apart from the pulmonary artery which goes to the lungs)
  • Have thick muscular walls - to withstand pressure
  • Have small passageways for blood (internal lumen)
  • Contain blood under high pressure


  • Carry blood to the heart (always de-oxygenated apart from the pulmonary vein which goes from the lungs to the heart)
  • Have thin walls
  • Have…



Thank you so much for the detailed explanation it has really helped me.


Rated 5 stars and added to favorites !

Great revision notes with detailed explanation , use of diagram for clearer explanation and bullet points to simplify things. Thanx a lot !


Great, thanks!


A very detailed set of notes on the circulatory system with useful, clear colour diagrams to help illustrate the key points.  These notes would be useful to students studying this topic as part of their specification. Try writing a set of flashcards or a glossary of key terms to use alongside this resource.


i wish I found it sooner on 2015 exam... Good notes thank you with great illustration of the circulatory system. Good job.






Thank you so much! This has really helped me, and I understand it better than when I was taught yesterday. Rated 5 stars and added to favourites


this is so helpful 

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