Practice free Breathing and Exchange of Gases (Zoology) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
Under normal physiological conditions, every 100 ml of oxygenated blood delivers approximately how much O2 to the tissues?
The NCERT states, 'Every 100 ml of oxygenated blood can deliver around 5 ml of O2 to the tissues under normal physiological conditions.'
Regarding the transport of carbon dioxide in the blood, what percentage is primarily carried as bicarbonate?
The NCERT states, 'Nearly 20-25 per cent of CO2 is transported by RBCs whereas 70 per cent of it is carried as bicarbonate. About 7 per cent of CO2 is carried in a dissolved state through plasma.'
Which of the following conditions at the alveoli are favorable for the formation of oxyhaemoglobin?
The NCERT mentions, 'In the alveoli, where there is high pO2, low pCO2, lesser H+ concentration and lower temperature, the factors are all favourable for the formation of oxyhaemoglobin...'
The binding of oxygen with haemoglobin is primarily related to:
The NCERT states, 'Binding of oxygen with haemoglobin is primarily related to partial pressure of O2. Partial pressure of CO2, hydrogen ion concentration and temperature are the other factors which can interfere with this binding.'
Which brain region is primarily responsible for the regulation of respiratory rhythm?
According to the NCERT text, 'A specialised centre present in the medulla region of the brain called respiratory rhythm centre is primarily responsible for this regulation.'
The pneumotaxic center, located in the pons region of the brain, has which of the following effects on respiration?
The NCERT states, 'Another centre present in the pons region of the brain called pneumotaxic centre can moderate the functions of the respiratory rhythm centre. Neural signal from this centre can reduce the duration of inspiration and thereby alter the respiratory rate.'
A chemosensitive area adjacent to the rhythm center is highly sensitive to which of the following substances?
The NCERT chapter mentions, 'A chemosensitive area is situated adjacent to the rhythm centre which is highly sensitive to CO2 and hydrogen ions.'
An increase in $\text{CO}_2$ and hydrogen ions in the blood will lead to which of the following responses in the respiratory system?
As per the NCERT text, 'Increase in these substances [CO2 and hydrogen ions] can activate this centre, which in turn can signal the rhythm centre to make necessary adjustments in the respiratory process by which these substances can be eliminated.'
Receptors associated with which major arteries also play a role in recognizing changes that affect respiratory regulation?
The NCERT states, 'Receptors associated with aortic arch and carotid artery also can recognise changes...'
The ability of humans to maintain and moderate the respiratory rhythm to suit body demands is primarily controlled by which system?
The NCERT states, 'Human beings have a significant ability to maintain and moderate the respiratory rhythm to suit the demands of the body tissues. This is done by the neural system.'
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