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 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
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2. what does the fluid in blood, plasma, contain?

  • mainly water, and dissolved substances eg food, oxygen and co2
  • water and oxygen or co2
  • food and other molecules, proteins and water
  • water and dissolved molecules

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. how does the blood flow in a closed circulatory system?

  • it circulates in large open spaces
  • blood is enclosed in tubes and is forced along fairly narrow channels
  • heart pumps blood into cavities surrounding organs

5. which valves are closed during diastole?

  • semilunar valves
  • atrioventricular valves
  • bicuspid valves
  • tricuspid valves

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