ï»¿ How is respiration regulated ? from Biology Breathing and Exchange of Gases Class 11 Assam Board

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Breathing and Exchange of Gases

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How is respiration regulated ?

The respiration is regulated in the following ways :

The neural system is involved in regulating the respiration.Â

i. Respiratory rhythm centre - A specialised centre present in the medulla regionÂ of the brain is primarily responsible for the regulation of respiration.

ii. Pneumotaxic centre - in the pons region of the brain moderates the functions of the respiratoryÂ rhythm centre. Neural signal from this centre can reduce the duration ofÂ inspiration and thereby alter the respiratory rate.

iii. A chemosensitive area situated adjacent to the rhythm centre which is highly sensitive to CO2Â and hydrogen ions. Increase in these substances can activate the centre which signals the rhythm centre to make the necessary adjustmentsÂ in the respiratory process by which these substances can be eliminated.

iv. Aortic arch and carotid artery receptore also recognise changes in CO2 and H+ concentration and send necessary signals to theÂ rhythm centre for necessary actions. Oxygen plays a vital role in the regulation of respiratory rhythm.

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By what amount the solubility of carbondioxide is more than the solubility of oxygen?

20 - 25 times
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70% of carbondioxide is transported as ?

Bicarbonate
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Name the cavity having lungs.

Thoracic cavity.
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Oxygen is carried by haemoglobin as?

Oxyhaemoglobin.
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What is the partial pressure of oxygen in Â oxygenated blood ?

95 mm Hg
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