QBManager

BREATHING and EXCHANGE OF GASES(NCERT)

286102 During transport of $C O_{2}$ , blood does not become acidic due to

1 neutralization of

H_{2} C O_{3}

by

N a_{2} C O_{3}

2 absorption by leucocytes

3 blood buffers

4 nonaccumulation

NCERT (Page-275 / N-190

BREATHING and EXCHANGE OF GASES(NCERT)

286103 The conditions favourable for formation of oxyhaemoglobin are:

1 high

p O_{2}

, high

pC O_{2}

, high

H^{+}

conc., low temperature

2 low

p O_{2}

, low

pC O_{2}

, high

H^{+}

conc., high temperature

3 high

p O_{2}

, low

pC O_{2}

, low

H^{+}

conc., low temperature

4 high

p O_{2}

, high

pC O_{2}

, low

H^{+}

conc., high temperature

NCERT Page-274 / N-189

BREATHING and EXCHANGE OF GASES(NCERT)

286104 Although much $C O_{2}$ is carried in blood, yet blood does not become acidic, because:

1 it is absorbed by the leucocytes.

2 blood buffers play an important role in

C O_{2}

transport.

3 it combines with water to form

H 2 CO

which is neutralised by

N a_{2} C O_{3}

.

4 it is continuously diffused through tissues and is not allowed to accumulate.

Explanation:

(b) $C O_{2}$ enters $RBC$ and reacts with water to form carbonic acid. Carbonic acid dissociates to form bicarbonate and hydrogen ions. Some bicarbonate ions are transported in erythrocytes while some diffuse into the blood plasma. Exit of bicarbonate ions changes the ionic balance, between the plasma and erythrocytes. To restore this balance, chloride ions diffuse from plasma into erythrocytes. Due to this, the $pH$ of blood is maintained.

NCERT (Page-275 / N-190

BREATHING and EXCHANGE OF GASES(NCERT)

286105 What would happen if human blood becomes acidic (low pH)?

1 Oxygen carying capacity of haemoglobin increases.

2 Oxygen carrying capacity of haemoglobin decreases.

3 RBCs count increases.

4 RBCs count decreases

NCERT Page-274 / N-189

BREATHING and EXCHANGE OF GASES(NCERT)

286106 Carbon dioxide is transported from tissues to respiratory surface by:

1 Plasma and erythrocytes

2 Plasma

3 Erythrocytes

4 Erythrocytes and leucocytes

Explanation:

(a) $C O_{2}$ from the respiratory tissues to the lungs is transported by the blood in 3 ways :

NCERT (Page-274 / N-189

BREATHING and EXCHANGE OF GASES(NCERT)

286102 During transport of $C O_{2}$ , blood does not become acidic due to

1 neutralization of

H_{2} C O_{3}

by

N a_{2} C O_{3}

2 absorption by leucocytes

3 blood buffers

4 nonaccumulation

NCERT (Page-275 / N-190

BREATHING and EXCHANGE OF GASES(NCERT)

286103 The conditions favourable for formation of oxyhaemoglobin are:

1 high

p O_{2}

, high

pC O_{2}

, high

H^{+}

conc., low temperature

2 low

p O_{2}

, low

pC O_{2}

, high

H^{+}

conc., high temperature

3 high

p O_{2}

, low

pC O_{2}

, low

H^{+}

conc., low temperature

4 high

p O_{2}

, high

pC O_{2}

, low

H^{+}

conc., high temperature

NCERT Page-274 / N-189

BREATHING and EXCHANGE OF GASES(NCERT)

286104 Although much $C O_{2}$ is carried in blood, yet blood does not become acidic, because:

1 it is absorbed by the leucocytes.

2 blood buffers play an important role in

C O_{2}

transport.

3 it combines with water to form

H 2 CO

which is neutralised by

N a_{2} C O_{3}

.

4 it is continuously diffused through tissues and is not allowed to accumulate.

Explanation:

(b) $C O_{2}$ enters $RBC$ and reacts with water to form carbonic acid. Carbonic acid dissociates to form bicarbonate and hydrogen ions. Some bicarbonate ions are transported in erythrocytes while some diffuse into the blood plasma. Exit of bicarbonate ions changes the ionic balance, between the plasma and erythrocytes. To restore this balance, chloride ions diffuse from plasma into erythrocytes. Due to this, the $pH$ of blood is maintained.

NCERT (Page-275 / N-190

BREATHING and EXCHANGE OF GASES(NCERT)

286105 What would happen if human blood becomes acidic (low pH)?

1 Oxygen carying capacity of haemoglobin increases.

2 Oxygen carrying capacity of haemoglobin decreases.

3 RBCs count increases.

4 RBCs count decreases

NCERT Page-274 / N-189

BREATHING and EXCHANGE OF GASES(NCERT)

286106 Carbon dioxide is transported from tissues to respiratory surface by:

1 Plasma and erythrocytes

2 Plasma

3 Erythrocytes

4 Erythrocytes and leucocytes

Explanation:

(a) $C O_{2}$ from the respiratory tissues to the lungs is transported by the blood in 3 ways :

NCERT (Page-274 / N-189

BREATHING and EXCHANGE OF GASES(NCERT)

286102 During transport of $C O_{2}$ , blood does not become acidic due to

1 neutralization of

H_{2} C O_{3}

by

N a_{2} C O_{3}

2 absorption by leucocytes

3 blood buffers

4 nonaccumulation

NCERT (Page-275 / N-190

BREATHING and EXCHANGE OF GASES(NCERT)

286103 The conditions favourable for formation of oxyhaemoglobin are:

1 high

p O_{2}

, high

pC O_{2}

, high

H^{+}

conc., low temperature

2 low

p O_{2}

, low

pC O_{2}

, high

H^{+}

conc., high temperature

3 high

p O_{2}

, low

pC O_{2}

, low

H^{+}

conc., low temperature

4 high

p O_{2}

, high

pC O_{2}

, low

H^{+}

conc., high temperature

NCERT Page-274 / N-189

BREATHING and EXCHANGE OF GASES(NCERT)

286104 Although much $C O_{2}$ is carried in blood, yet blood does not become acidic, because:

1 it is absorbed by the leucocytes.

2 blood buffers play an important role in

C O_{2}

transport.

3 it combines with water to form

H 2 CO

which is neutralised by

N a_{2} C O_{3}

.

4 it is continuously diffused through tissues and is not allowed to accumulate.

Explanation:

(b) $C O_{2}$ enters $RBC$ and reacts with water to form carbonic acid. Carbonic acid dissociates to form bicarbonate and hydrogen ions. Some bicarbonate ions are transported in erythrocytes while some diffuse into the blood plasma. Exit of bicarbonate ions changes the ionic balance, between the plasma and erythrocytes. To restore this balance, chloride ions diffuse from plasma into erythrocytes. Due to this, the $pH$ of blood is maintained.

NCERT (Page-275 / N-190

BREATHING and EXCHANGE OF GASES(NCERT)

286105 What would happen if human blood becomes acidic (low pH)?

1 Oxygen carying capacity of haemoglobin increases.

2 Oxygen carrying capacity of haemoglobin decreases.

3 RBCs count increases.

4 RBCs count decreases

NCERT Page-274 / N-189

BREATHING and EXCHANGE OF GASES(NCERT)

286106 Carbon dioxide is transported from tissues to respiratory surface by:

1 Plasma and erythrocytes

2 Plasma

3 Erythrocytes

4 Erythrocytes and leucocytes

Explanation:

(a) $C O_{2}$ from the respiratory tissues to the lungs is transported by the blood in 3 ways :

NCERT (Page-274 / N-189

BREATHING and EXCHANGE OF GASES(NCERT)

286102 During transport of $C O_{2}$ , blood does not become acidic due to

1 neutralization of

H_{2} C O_{3}

by

N a_{2} C O_{3}

2 absorption by leucocytes

3 blood buffers

4 nonaccumulation

NCERT (Page-275 / N-190

BREATHING and EXCHANGE OF GASES(NCERT)

286103 The conditions favourable for formation of oxyhaemoglobin are:

1 high

p O_{2}

, high

pC O_{2}

, high

H^{+}

conc., low temperature

2 low

p O_{2}

, low

pC O_{2}

, high

H^{+}

conc., high temperature

3 high

p O_{2}

, low

pC O_{2}

, low

H^{+}

conc., low temperature

4 high

p O_{2}

, high

pC O_{2}

, low

H^{+}

conc., high temperature

NCERT Page-274 / N-189

BREATHING and EXCHANGE OF GASES(NCERT)

286104 Although much $C O_{2}$ is carried in blood, yet blood does not become acidic, because:

1 it is absorbed by the leucocytes.

2 blood buffers play an important role in

C O_{2}

transport.

3 it combines with water to form

H 2 CO

which is neutralised by

N a_{2} C O_{3}

.

4 it is continuously diffused through tissues and is not allowed to accumulate.

Explanation:

(b) $C O_{2}$ enters $RBC$ and reacts with water to form carbonic acid. Carbonic acid dissociates to form bicarbonate and hydrogen ions. Some bicarbonate ions are transported in erythrocytes while some diffuse into the blood plasma. Exit of bicarbonate ions changes the ionic balance, between the plasma and erythrocytes. To restore this balance, chloride ions diffuse from plasma into erythrocytes. Due to this, the $pH$ of blood is maintained.

NCERT (Page-275 / N-190

BREATHING and EXCHANGE OF GASES(NCERT)

286105 What would happen if human blood becomes acidic (low pH)?

1 Oxygen carying capacity of haemoglobin increases.

2 Oxygen carrying capacity of haemoglobin decreases.

3 RBCs count increases.

4 RBCs count decreases

NCERT Page-274 / N-189

BREATHING and EXCHANGE OF GASES(NCERT)

286106 Carbon dioxide is transported from tissues to respiratory surface by:

1 Plasma and erythrocytes

2 Plasma

3 Erythrocytes

4 Erythrocytes and leucocytes

Explanation:

(a) $C O_{2}$ from the respiratory tissues to the lungs is transported by the blood in 3 ways :

NCERT (Page-274 / N-189

BREATHING and EXCHANGE OF GASES(NCERT)

286102 During transport of $C O_{2}$ , blood does not become acidic due to

1 neutralization of

H_{2} C O_{3}

by

N a_{2} C O_{3}

2 absorption by leucocytes

3 blood buffers

4 nonaccumulation

NCERT (Page-275 / N-190

BREATHING and EXCHANGE OF GASES(NCERT)

286103 The conditions favourable for formation of oxyhaemoglobin are:

1 high

p O_{2}

, high

pC O_{2}

, high

H^{+}

conc., low temperature

2 low

p O_{2}

, low

pC O_{2}

, high

H^{+}

conc., high temperature

3 high

p O_{2}

, low

pC O_{2}

, low

H^{+}

conc., low temperature

4 high

p O_{2}

, high

pC O_{2}

, low

H^{+}

conc., high temperature

NCERT Page-274 / N-189

BREATHING and EXCHANGE OF GASES(NCERT)

286104 Although much $C O_{2}$ is carried in blood, yet blood does not become acidic, because:

1 it is absorbed by the leucocytes.

2 blood buffers play an important role in

C O_{2}

transport.

3 it combines with water to form

H 2 CO

which is neutralised by

N a_{2} C O_{3}

.

4 it is continuously diffused through tissues and is not allowed to accumulate.

Explanation:

(b) $C O_{2}$ enters $RBC$ and reacts with water to form carbonic acid. Carbonic acid dissociates to form bicarbonate and hydrogen ions. Some bicarbonate ions are transported in erythrocytes while some diffuse into the blood plasma. Exit of bicarbonate ions changes the ionic balance, between the plasma and erythrocytes. To restore this balance, chloride ions diffuse from plasma into erythrocytes. Due to this, the $pH$ of blood is maintained.

NCERT (Page-275 / N-190

BREATHING and EXCHANGE OF GASES(NCERT)

286105 What would happen if human blood becomes acidic (low pH)?

1 Oxygen carying capacity of haemoglobin increases.

2 Oxygen carrying capacity of haemoglobin decreases.

3 RBCs count increases.

4 RBCs count decreases

NCERT Page-274 / N-189

BREATHING and EXCHANGE OF GASES(NCERT)

286106 Carbon dioxide is transported from tissues to respiratory surface by:

1 Plasma and erythrocytes

2 Plasma

3 Erythrocytes

4 Erythrocytes and leucocytes

Explanation:

(a) $C O_{2}$ from the respiratory tissues to the lungs is transported by the blood in 3 ways :

NCERT (Page-274 / N-189

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