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Regulation of Respiration

Chemosensitiv...

Question

Chemosensitive area of respiratory centre in medulla is affected by

A

Less

C O_{2}

and H+ ions

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B

Less

O_{2}

and H+ ions

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C

Excess

C O_{2}

and H+ ions

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D

Excess

O_{2}

and H+ ions

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Solution

The correct option is C Excess $C O_{2}$ and H+ ions
Respiratory rhythm centre is a specialised centre present in the medulla of the brain which is primarily responsible for the regulation of respiration. A chemosensitive area situated adjacent to the rhythm centre is highly sensitive to changes in $C O_{2}$ and hydrogen ion concentrations in blood. Increase in $C O_{2}$ and H+ ions stimulate this centre, which in turn stimulate the rhythm centre to make necessary adjustments in the respiratory process by which these substances can be eliminated.
So, the correct answer is 'Excess CO $_{2}$ and H $^{+}$ ions'.

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Chemosensitive area of the respiratory centre in medulla is affected by

C (d i a m o n d) + O_{2} \to C O_{2}; △ H = - 395 k J

C (g r a p h i t e) + O_{2} \to C O_{2}; △ H = - 393 k J

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Q. In response to

C O_{2}

H^{+}

concentration, the chemosensitive area and, receptors associated with aortic arch and carotid artery, send necessary signals for remedial action to _______________.

Choose the right sequential phenomena among the following during the delivery of

O_{2}

from blood to tissue.

P: Absorption of

C O_{2}

Q: Reaction of absorbed

C O_{2}

H_{2} O

H_{2} C O_{3}

within RBC and its conversion into

H^{+}

H C O_{3}^{-}

R: Reaction of absorbed

C O_{2}

H_{2} O

in plasma to form

H_{2} C O_{3}

and its conversion into

H^{+}

H C O_{3}^{-}

S: Combination of

H^{+}

with heme portion of

H b O_{2}

O_{2}

T: Combination of

H C O_{3}^{-}

with heme portion of

H b O_{2}

to form reduced hemoglobin and release of

O_{2}

Q. Choose the right sequential phenomena among the following during the delivery of

O_{2}

from blood tissue.
P : Absorption of

C O_{2}

by the blood.
Q : Reaction of absorbed

C O_{2}

H_{2} O

H_{2} C O_{3}

within RBC and its conversion into

H^{+}

H C O_{3}^{-}

ions in the presence of carbonic anhydrase enzyme.
R : Reaction of absorbed

C O_{2}

H_{2} O

in plasma to form

H_{2} C O_{3}

and its conversion into

H^{+}

H C O_{3}^{-}

ions in the presence of carbonic anhydrase enzyme.
S : Combination of

H^{+}

with heme portion of

H b O_{2}

O_{2}

.
T : Combination of

H C O_{3}^{-}

with heme portion

H b O_{2}

to form reduced hemoglobin and release of

O_{2}

.

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