Past paper Qs

• what is the function of cholesterol?

  >It is a component of cell membranes, where it controls permeability.

  >It is a precursor of vitamin D and steroid hormones e.g. Sex hormones testosterone and oestrogen.
• Describe what is happening during stage X

  Clotting factors are released

  
• Name substance A and B

  A-prothrombin

  B-fibrinogen

  
• A blood clot can break away from the site of formation and enter the general circulation

  -Name this type of blood clot

  An embolus
• Describe how the movement of a blood clot can lead to heart attack

  >the cot blocks a cornonary artey

  >this result in a lack of oxygen being supplied to muscles