Blood pressure physiology - BM5 RCR1&2

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1. Which of the following most accurately describes C fibres?

  • Very abundant, small diameter, slow conducting (myelinated) & respond at high threshold
  • Not very abundant, small diameter, slow conducting (unmyelinated) & respond at high threshold
  • Very abundant, small diameter, slow conducting (unmyelinated) & respond at high threshold
  • Very abundant, small diameter, slow conducting (unmyelinated) & respond at low threshold
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2. At normal pressures, ~25% of C fibres are firing. If blood pressure increases, will the number of firing C fibres increase or decrease?

  • Increase
  • Decrease

3. At what pressures should antihypertensive treatment definitely be initiated?

  • Systolic >140 or Diastolic >90
  • Systolic >130 or Diastolic >85
  • Systolic >160 or Diastolic >100
  • Systolic >150 or Diastolic >95

4. True or false: Hypertension is primarily a disease of peripheral resistance?

  • True
  • False

5. What is pulse pressure?

  • The difference between systolic BP and diastolic BP (~40mmHg)
  • (Diastolic BP + Systolic BP) / 2
  • Arterial systolic blood pressure minus resistance encountered at pulse points (~100mmHg)
  • The blood pressure if measured at pulse points (~130/90mmHg)

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