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. (in atherosclerosis) once the endothelium is damaged, white blood cells move into artery wall and accumulate what? and what is the deposit that builds up called?

  • a) c02 b) atheroscleroma
  • a) cholesterol b) a blood clot
  • a) cholesterol b) atheroma
  • a) water molecules b) atheroma
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2. (stage 3 in atherosclerosis) ~ what also builds up at the inner artery wall, causing a plaque?

  • calcium salts and fibrous tissue
  • other insoluble molecules and platelets
  • platelets
  • fibrous tissue and platelets

3. what happens in a heart attack?

  • a fatty plaque in the coronary arteries ruptures and cholesterol is released which leads to rapid clot formation. the blood supply to heart is blocked completely. affected muscle cells oxygen deprived for long time = permanent damage
  • a platelet plug is formed and blood carrying oxygen is unable to be transported around to the heart, the heart is without blood (ischaemic) and is unable to work any more
  • a fatty deposit builds up inside a chamber in the heart, this stops blood from being pumped through the heart and the heart is oxygen deprived. this means it cannot continue pumping blood to the body and starts to beat irregularly.

4. the blood is supplied to the heart though two vessels called the...?

  • coronary arteries
  • the pulmonary arteries
  • the pulmonary veins

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

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

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