BMS1032 cardio example Q's

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1. arteries:

  • dampen the pulsatile flow of blood emerging from the heart
  • carry oxygenated blood in both systematic and pulmonary circulation
  • are sites of gaseous exchange with tissues
  • are very distensible compared to veins
  • contain valves to prevent backflow
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2. platelets:

  • aggregate by a process inhibited by asprin
  • are fragmented monocytes
  • are nucleated
  • store fibrin
  • store clotting factors

3. the tricuspid valve:

  • is composed of vascular smooth muscle
  • guards the entrance to the left ventricle from the left atrium
  • is open during diastole
  • prevents backflow of blood when standing up
  • guards the entrance to the aorta from the left ventricle

4. clotting factors:

  • depend on vitamin D for their production
  • require Ca2+ as a cofactor in many instances
  • are important in platelet aggregation
  • some are produced in the liver by a vitamin B12 dependent process
  • catalyse the conversion of fibrin to thrombin

5. the baroreceptor reflex:

  • is responsible for the regulation of heart rate
  • increases heart rate in response to an increase of bp
  • is mediated by receptors in the heart
  • is an example of a negative feedback process
  • utilises chemoreceptors located in the brain


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