NEET 2015 Biology question

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

(1)rising concentrationCorrect
(2)falling concentration
(3)rising and falling concentration
(4)falling concentration

Answer: (1)

Solution

The respiratory rhythm centre in the medulla is highly sensitive to and H ions. When breath is held, accumulates in the blood and its rising concentration (hypercapnia) is the first and strongest stimulus for the

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Question ID VK-091764