The rate of respiration is directly proportional to:

  • A
    Concentration of oxygen in blood
  • B
    Concentration of carbon dioxide in blood
  • C
    Oxygen in trachea
  • D
    Diaphragm expansion

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Respiratory centre of the brain is stimulated by

When you hold your breath,which of the following gas changes in blood would first lead to the urge to breathe?

Which of the following changes usually tends to occur in plain dwellers when they move to high altitudes?
$I.$ Increased breathing rate
$II.$ Increased $RBC$ production
$III.$ Increased $WBC$ production
$IV.$ Increased thrombocyte count
Choose the correct option.

Which part of the human brain controls the breathing movements?

The breathing centre initiates the ventilation in response to

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