1.1 what is cardiovascular disease? and how does circulation work?

SNAB edexcel A2 biology topic 1:

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  • Created by: _lauren
  • Created on: 01-01-15 18:41

1. what happens when platelets come into contact with damaged vessel wall?

  • they change from discs to spheres with long projections and their cell surfaces change making them stick to the exposed collagen and to each other forming a platelet plug. they also release substances to activate more platelets.
  • they release a sticky substance and stick to the formed plaque, forming a platelet plug. they also release substances to activate more platelets
  • they release a chemical which activates more platelets causing a build up of platelets and so blood cannot flow though properly.
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Other questions in this quiz

2. what causes the pain of angina? (usually experienced during exertion)

  • the heart lacking oxygen causes it to respire anaerobically, this results in chemical changes triggering the pain.
  • a build up of fat deposits causes a blood clot which narrows the arteries and stops the right amount of blood circulating around the body
  • supply of blood to heart and brain is slightly interupted

3. what happens when there is a plaque in an artery?

  • blood flow speeds up and so pressure increase and the artery becomes more damaged
  • the artery becomes narrower and positive feedback builds up, causing raised blood pressure.
  • the artery narrows and blood flow slows down, decreasing blood pressure

4. water is what type of molecule?

  • ionic
  • dipolar
  • polar
  • soluble

5. during ventricular systole, the pressure of blood against the atrioventricular valves does what?

  • damages them
  • closes them
  • opens them


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