Practice free Zoology NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
Which of the following conditions in the tissues would favour the dissociation of oxygen from oxyhaemoglobin?
The NCERT states, 'whereas in the tissues, where low $pO_2$, high $pCO_2$, high $H^+$ concentration and higher temperature exist, the conditions are favourable for dissociation of oxygen from the oxyhaemoglobin.'
What is the primary factor directly impacting the binding of oxygen with haemoglobin?
According to the NCERT, 'Binding of oxygen with haemoglobin is primarily related to partial pressure of $O_2$.'
The oxygen dissociation curve is a plot of:
The NCERT defines it as, 'A sigmoid curve is obtained when percentage saturation of haemoglobin with $O_2$ is plotted against the $pO_2$. This curve is called the Oxygen dissociation curve.'
In the alveoli, which of the following conditions would favour the formation of oxyhaemoglobin?
The NCERT states, 'In the alveoli, where there is high $pO_2$, low $pCO_2$, lesser $H^+$ concentration and lower temperature, the factors are all favourable for the formation of oxyhaemoglobin.'
Under normal physiological conditions, how much $O_2$ can 100 ml of oxygenated blood deliver to the tissues?
The NCERT mentions, 'Every 100 ml of oxygenated blood can deliver around 5 ml of $O_2$ to the tissues under normal physiological conditions.'
The sigmoidal shape of the oxygen dissociation curve is primarily due to:
While not explicitly stated in the provided text as the reason for the sigmoidal shape, the cooperative binding of oxygen to haemoglobin (where binding of one $O_2$ molecule increases the affinity for subsequent $O_2$ molecules) is the well-known biological explanation for the sigmoidal pattern of the oxygen dissociation curve. The text only asks to 'suggest any reason for its sigmoidal pattern' as an exercise, implying it's a concept to be understood.
Which of the following factors would cause a shift of the oxygen dissociation curve to the right?
A shift to the right indicates decreased affinity of haemoglobin for oxygen, favouring dissociation. The NCERT states that high $pCO_2$ and high $H^+$ concentration (which corresponds to low pH) favor dissociation in tissues. Therefore, an increase in $H^+$ concentration would cause a right shift.
What percentage of $O_2$ is transported by RBCs?
The NCERT states, 'About 97 per cent of $O_2$ is transported by RBCs in the blood.'
Which component of blood primarily carries oxygen to the cells?
The NCERT mentions, 'About 97 per cent of $O_2$ is transported by RBCs in the blood.' Erythrocytes are Red Blood Cells (RBCs).
Aside from partial pressure of $O_2$, what other factors can interfere with the binding of oxygen with haemoglobin?
The NCERT states, 'Partial pressure of $CO_2$, hydrogen ion concentration and temperature are the other factors which can interfere with this binding.'
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