Class 11 Biology - Chapter Breathing and Exchange of Gasses NCERT Solutions | How is respiration regulated?
How is respiration regulated?
The respiratory rhythm centre present in the medulla region of the brain is primarily responsible for the regulation of respiration. The pneumotaxic centre can alter the function performed by the respiratory rhythm centre by signalling to reduce the inspiration rate.
The chemosensitive region present near the respiratory centre is sensitive to carbon dioxide and hydrogen ions. This region then signals to change the rate of expiration for eliminating the compounds.
The receptors present in the carotid artery and aorta detect the levels of carbon dioxide and hydrogen ions in blood. As the level of carbon dioxide increases, the respiratory centre sends nerve impulses for the necessary changes.
More Questions From Class 11 Biology - Chapter Breathing and Exchange of Gasses
- Q:- What are the major transport mechanisms for CO2? Explain.
- Q:- What will be the pO2 and pCO2 in the atmospheric air compared to those in the alveolar air?
(i) pO2 lesser, pCO2 higher
(ii) pO2 higher, pCO2 lesser
(iii) pO2 higher, pCO2 higher
(iv) pO2 lesser, pCO2 lesser - Q:-
Define oxygen dissociation curve. Can you suggest any reason for its sigmoidal pattern?
- Q:- Diffusion of gases occurs in the alveolar region only and not in the other parts of respiratory system. Why?
- Q:- Define vital capacity. What is its significance?
- Q:- Explain the process of inspiration under normal conditions.
- Q:-
Distinguish between
(a) IRV and ERV
(b) Inspiratory capacity and Expiratory capacity
(c) Vital capacity and Total lung capacity - Q:-
What is the effect of pCO2 on oxygen transport?
- Q:- State the volume of air remaining in the lungs after a normal breathing.
- Q:- What happens to the respiratory process in a man going up a hill?
Popular Questions of Class 11 Biology
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- Q:-
Which of the following is not correct?
(a) Robert Brown discovered the cell.
(b) Schleiden and Schwann formulated the cell theory.
(c) Virchow explained that cells are formed from pre-existing cells.
(d) A unicellular organism carries out its life activities within a single cell. - Q:- What are macromolecules? Give examples.
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(i) protonema
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(iii) archegonium
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