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 does the fluid in blood, plasma, contain?

  • water and dissolved molecules
  • mainly water, and dissolved substances eg food, oxygen and co2
  • food and other molecules, proteins and water
  • water and oxygen or co2
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2. what happens when platelets come into contact with damaged vessel wall?

  • they release a chemical which activates more platelets causing a build up of platelets and so blood cannot flow though properly.
  • 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

3. what does it mean if something is a polar molecule

  • it has an unevenly distributed electrical charge
  • it has an evenly distributed electrical charge
  • it consists of a giant lattice of oppositely charged ions

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

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

5. what is the pain of the narrowing of coronary arteries called? (it limits the amount of oxygen-rich blood reaching the heart muscle)

  • CVD
  • atherosclerosis
  • angina
  • coronary heart disease


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