A) \[{{C}_{2}}\to R\to PT\to {{C}_{1}}\]
B) \[PT\to \underset{\underset{{}}{\mathop {{C}_{1}}}\,}{\mathop{\underset{\underset{{}}{\mathop \downarrow }\,}{\mathop{R}}\,}}\,\to {{C}_{2}}\]
C) \[{{C}_{1}}\to \underset{R}{\mathop{\underset{\downarrow }{\mathop{PT}}\,}}\,\to {{C}_{2}}\]
D) \[PT\to \underset{R}{\mathop{\underset{\downarrow }{\mathop{{{C}_{2}}}}\,}}\,\to {{C}_{1}}\]
Correct Answer: B
Solution :
Human beings maintain and moderate the respiratory rhythm by the neural system to suit the demands of the body tissue. It occurs in following ways: (i) a specialized centre present in the medulla region of the brain called respiratory rhythm centre is primarily responsible in regulating respiration process. 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. (ii) A chemosensitive area is situated adjacent to the rhythm centre which is highly sensitive to \[C{{O}_{2}}\] and hydrogen ions. Increased concentration of these ions activates this centre, which in turn signals the rhythm centre to make necessary adjustments in the respiratory process by which these substances can be eliminated, (iii) Receptors associated with aortic arch and carotid artery also recognise changes in \[C{{O}_{2}}\] and \[{{H}^{+}}\] concentration and send necessary signals to the rhythm centre for remedial action because the role of oxygen in the regulation of respiratory rhythm is quite insignificant.
You need to login to perform this action.
You will be redirected in
3 sec
