BMS1032 cardio example Q's

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1. arterial blood pressure:

  • when reduced is termed hypertension
  • is sensed in the carotid sinus
  • is similar in value in the aorta to pulmonary artery
  • the minimum value recorded in the arteries is termed systolic pressure
  • may be measured with an electrocardiogram
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2. the baroreceptor reflex:

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

3. the sympathetic nervous system when activated:

  • decrease blood flow
  • releases Ach from postganglionic nerve fibres
  • decreases heart rate
  • increases systemic vascular resistance (causes vasocontriction)
  • decreases the strength of cardiac contraction

4. the ECG:

  • is increased as the strength of the heart beat increases
  • contains a p wave of great magnitude than the qrs complex
  • occurs at the same rate as the arterial pulse in a healthy individual
  • is measured with a stethoscope
  • contains a r wave caused by ventricular repolarisation

5. deoxygenated blood:

  • is filtered through the lymphatic system
  • carried less co2 than oxygenated blood
  • is carried in the pulmonary veins
  • remains about 75% saturated with o2
  • contains less haemoglobin than oxygenated blood

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