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Breathing vs. Respiration

The respirato...

Question

The respiratory centre in the brain is stimulated by $C O_{2}$

A

$C O_{2}$ concentration in venous blood

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B

$O_{2}$ concentration in arterial blood

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C

$C O_{2}$ concentration in arterial blood

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D

$O_{2}$ concentration in venous blood

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Solution

The correct option is A
$C O_{2}$ concentration in venous blood

The body's respiratory centre in the medulla is normally stimulated by an increased concentration of carbon dioxide, and to a lesser extent, by decreased levels of oxygen in arterial blood. Stimulation of the respiratory centre causes an increase in the rate and depth of breathing, thus blowing off excess carbon dioxide and reducing blood acidity.

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Similar questions

Which statement about $C O_{2}$ is incorrect?

Q. 1 molecule of Haemoglobin carries .........( 1) ........ molecule/s of oxygen, but 1 molecule of Myoglobin carries .........( 2) ........molecule/s of oxygen. 1 gm. of haemoglobin carries......... (3) ........ ml. of oxygen, and 100 ml. of blood carries......... (4) ........ ml. of oxygen. The partial pressure of

C O_{2}

, in arterial and venous blood is .........( 5) ........ and .........( 6)............,whereas the partial pressure of

O_{2}

, in arterial and venous blood is ........ .(7).. ...... and ........ .(8) ........ Maximum

O_{2}

is carried through ......... (9) ........ of blood while maximum

C O_{2}

is carried through ......... (10) ........ of blood.

Q. Each 100 ml of human arterial blood carries P ml of

O_{2}

C O_{2}

whereas each 100 ml of venous blood carries R ml of

O_{2}

C O_{2}

. Choose the CORRECT values of P, Q, R and S.

Q. Mixing up of arterial and venous blood does not take place in a___________ heart.

Q. The circulation of blood in human body supplies

O_{2}

C O_{2}

. The concentration of

O_{2}

C O_{2}

is variable but on the average,

100 m L

0.02 g

O_{2}

0.08 g C O_{2}

. The volume of

O_{2}

C O_{2}

1 a t m

and body temperature

37^{\circ} C

10 L

blood in human body is:

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