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Blood-pressure depends on:

1. the cardiac output 
2. the resistance of the capillaries

Which of the following lists all the correct answers ?

  • A
    1 and 2 are correct
  • B
    1 and 2 are both false
  • C
    1 is false 2 is correct
  • D
    1 is correct 2 is false

BLOOD PRESSURE

Factors which influence blood pressure:

  1. Cardiac output - which can be calculated by the stroke volume multiplied by the heart rate;
  2. Peripheral vascular resistance (resistance of blood vessels) - how narrow or relaxed they are;
  3. Volume of circulating blood;
  4. Viscosity of blood;
  5. Elasticity of vessels walls.

Blood pressure increases with increased cardiac output, peripheral vascular resistance, volume of blood, viscosity of blood and rigidity of vessel walls.

Blood pressure decreases with decreased cardiac output, peripheral vascular resistance, volume of blood, viscosity of blood and elasticity of vessel walls.

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