Respiratory cycles begin with inspiration and end with expiration and are driven by the respiratory control centre. Which of the following statements best describes the sensory inputs to the respiratory centres?     Central chemoreceptors located on the carotid bodies in the neck monitor arterial blood chemistry.     Peripheral chemoreceptors detect an increase in the partial carbon dioxide pressure resulting in stimulation of the respiratory centres.     Stretch receptors in the brainstem are activated when the lungs expand.     Peripheral chemoreceptors monitor the chemistry of the cerebrospinal fluid to detect changes in pH.

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