Breathing and Exchange of Gases Test

TIME LEFT -

Question 1
4 / -1

During CO₂transport, HCO₃^- diffuses from erythrocytes to plasma and in turn upsets the onic balance momentarily. In order to keep the ionic balance, an equal number of Cl⁻ pass into the erythrocytes from plasma. The process is known as

A
Hamburger phenomenon

B
Bicarbonate shift

C
Carbonation

D
Bohr's effect

Question 2
4 / -1

Haldane effect plays more important role in promoting carbon dioxide tranport than that of the Bhr's effect in promoting oxygen trasnport because

A
oxyhaemoglobin is a stronger acid which donates hydrogen ion (H⁺) which in turn displace carbone dioxide from blood

B
carbaminohaemoglobin is a stronger acid which spilts into hydrogen ion (H⁺) and bicarbonate (HCO₃^-)

C
carbon dioxide reacts with water to form carbonic acid that lowers the pH in tissue

D
carbon dioxide is less soluble in venous blood than in arterial blood

Question 3
4 / -1

People living at sea level have around 5 million RBC per cubic millimetre of their blood whereas, those living at an altitude of 5400 metres have around 8 million. This is because at high altitude:

A
people eat more nutritive food so more RBCs are formed

B
people get pollution-free air to breathe and more oxygen is available

C
atmospheric oxygen level is less and hence, more RBCs are needed to absorb the required amount of oxygen to survive

D
there is more UV radiation which enhances RBC production

Question 4
4 / -1

Although much CO₂, is carried in blood yet blood does not become acidic because

A
It is absorbed by leucocytes

B
It combines with water to form H₂CO₃ , which neutralised by Na₂CO₃

C
In CO₂ transport, blood buffers play an important role

D
It is continuously diffused through the tissues and is not allowed to accumulate

Question 5
4 / -1

In the tissues, high concentrations of carbon dioxide

A
increases the affinity of haemoglobin to both oxygen and hydrogen

B
increases the affinity of haemoglobin to oxygen but decreases its affinity to hydrogen

C
decreases the affinity of haemoglobin to oxygen but increases its affinity to hydrogen

D
decreases the affinity of haemoglobin to both oxygen and hydrogen

Question 6
4 / -1

Identify the correct statement with reference to transport of respiratory gases by blood.

A
Haemoglobin is necessary for transport of carbon dioxide and carbonic anhydrase for transport of oxygen.

B
Haemoglobin is necessary for transport of oxygen and carbonic anhydrase for transport of carbon dioxide.

C
Only oxygen is transported by blood.

D
Only carbon dioxide is transported by blood.

Question 7
4 / -1

With reference to human respiration, which is correct?

A
Pulmonary ventilation is equal to alveolar ventilation.

B
Alveolar ventilation is less than pulmonary ventilation.

C
Alveolar ventilation is more than pulmonary ventilation.

D
Pulmonary ventilation is less than alveolar ventilation.

Question 8
4 / -1

Which of the following is true for CO₂ concentration?

A
More, in alveolar air than in expired air

B
More in expired air than in alveolar air

C
More in inspired air than in alveolar air

D
More in inspired air than in expired air

Question 9
4 / -1

Which of the following statements is true about RBCs in humans?

A
They carry about 20-25 per cent of CO₂

B
They transport 99.5 per cent of O₂

C
They transport about 80 per cent oxygen only and the rest 20 per cent of it is transported in dissolved state in blood-plasma

D
They do not carry CO₂ at all

Question 10
4 / -1

The urge to inhale in humans results from

A
rising PCO₂

B
rising PO₂

C
falling PCO₂

D
falling PO₂

Question 11
4 / -1

Which of the following statements is correct?

A
The contraction of internal intercostal muscles lifts up the ribs and sternum.

B
The RBCs transport oxygen only.

C
The thoracic cavity is anatomically an air tight chamber.

D
Healthy man can inspire approximately 500 mL of air per minute.

Question 12
4 / -1

The factor which does not affect the rate of alveolar diffusion is

A
solubility of gases

B
thickness of the membranes

C
pressure gradient

D
reactivity of the gases

Question 13
4 / -1

In humans, which of the following is not a step in respiration?

A
Alveolar diffusion of O₂ and CO₂

B
Transport of gases by blood

C
Diffusion of O₂ and CO₂ between blood and tissues

D
Utilisation of CO₂ by cells for catabolic reactions

Question 14
4 / -1

Which of the following is incorrect about the given graph?

A
The curve, is called oxygen dissociation curve.

B
The part ′A′ represents percentage saturation of haemoglobin with oxygen.

C
The part 'B' represents partial pressure of carbon dioxide.

D
This curve is highly useful in studying the effect of factors like PCO₂, H⁺ concentration, etc.

Question 15
4 / -1

Read the given statements and select the correct option.
Statement 1 : About 70% of CO₂ that enters RBCs changes into HCO₃^- for transport in plasma to the lungs where it reconverts into CO₂ for elimination.
Statement 2 : About 40% of CO₂ that enters RBCs changes into carbaminohaemoglobin which releases O₂ in the lungs.

A
Both statements 1 and 2 are correct and statement 2 is the correct explanation of statement 1.

B
Both statements 1 and 2 are correct but statement 2 is not the correct explanation of statement 1.

C
Statement 1 is correct and statement 2 is incorrect.

D
Both statements 1 and 2 are incorrect.

Question 16
4 / -1

Which of the following equations is correct?

A
CO₂ → H₂CO₃ → HCO₃^- + H⁺

B

C
CO₂ + H₂O → CH₄ + 2O₂

D

Question 17
4 / -1

The given graph shows an oxygen dissociation curve for haemoglobin.
Where in the body will haemoglobin be saturated at the percentages shown at points 1,2 and 3 on the graph?

A
Left ventricle-1,Pulmonary vein-2, Vena cava-3

B
Left ventricle-2, Pulmonary vein-1, Vena cava-3

C
Left ventricle-2, Pulmonary vein-3, Vena cava-1

D
Left ventricle-3, Pulmonary vein-2, Vena cava-1

Question 18
4 / -1

Consider the following four statements and select the correct option stating which ones are true (T) and which ones are false (F).
(i) Expiration is normally brought about by the relaxation of inspiratory muscles.
(ii) Oxyhaemoglobin can hold much less carbon dioxide in the form of carbaminohaemoglobin than what deoxyhaemoglobin can.
(iii) A person can expel air the air from the lungs by a forceful expiration.
(iv) A rise in PCO₂ increases the oxygen - affinity of haemoglobin.

A
(i) F, (ii) F, (iii) T, (iv) F

B
(i) T, (ii) T, (iii) F, (iv) F

C
(i) F, (ii) T, (iii) T, (iv) F

D
(i) T, (ii) T, (iii) T, (iv) F

Question 19
4 / -1

Consider the following four statements (I - iv) and select the correct option stating which ones are true (T) and which ones are false (F).
(i) Formation of oxyhaemoglobin occurs on alveolar surface.
(ii) During gaseous exchange the gases diffuse from high particle pressure to low partial pressure.
(iii) Carbon dioxide cannot be transporteed width haemoglobin.
(iv) Earthworm respires through parapodia.

A
(i)-T, (ii)-F, (iii)-T, (iv)-F

B
(i)-F, (ii)-F, (iii)-T, (iv)-F

C
(i)-T, (ii)-T, (iii)-T, (iv)-F

D
(i)T, (ii)-T, (iii)-F, (iv)-F

Question 20
4 / -1

Carbon monoxide can kill a person because of it's extermely high affinity for

A
haemoglobin

B
phytochrome

C
cytochrome

D
none of these

Question 21
4 / -1

One haemoglobin carries how many molecules of O₂?

A
4

B
2

C
6

D
8

Question 22
4 / -1

Fetal haemoglobin has X affinity for oxygen than that of mother's haemoglobin during gestation. X is

A
same

B
higher

C
lower

D
lower affinity earlier but higher later

Question 23
4 / -1

The exchange of gases in the alveoli of the lungs takes place by

A
passive transport

B
active transport

C
osmosis

D
simple diffusion

Question 24
4 / -1

When CO₂ concentration in blood increases, breathing becomes

A
shallower and slow

B
there is no effect on breathing

C
slow and deep

D
faster and deeper

Question 25
4 / -1

The enzyme that increases the reaction rate between CO₂ and H₂O in red blood cell is

A
carbonic anhydrase

B
adenylate cyclase

C
carbonic synthetase

D
alkaline phosphatase

Question 26
4 / -1

When temperature decreases, oxy-Hb curve becomes

A
more steep

B
straight

C
parabola

D
none of these

Question 27
4 / -1

During winter a person died during sleep, the room was closed and a container with burnt charcoal was found in the room. What may be the possible reason of his death?

A
Non-availability of oxygen

B
Hb has more affinity to combine with carbon monoxide

C
Hb has more affinity to combine with carbon dioxide

D
Combined effect of both (a) and (b)

Question 28
4 / -1

The partial pressure of oxygen is maximum in

A
alveolar air

B
aterial blood

C
venous blood

D
expired air

Question 29
4 / -1

After taking a long deep breath we do not respire for some seconds due to

A
More CO₂ in blood

B
More O₂ in blood

C
Less CO₂ in blood

D
Less O₂ in blood

Question 30
4 / -1

Which of the following would have the same O₂ content?

A
Blood entering the lungs and blood leaving the lungs

B
Blood entering the right side of the heart and blood leaving the right side of the heart

C
Blood entering the right side of the heart and blood leaving the left side of the heart

D
Blood entering the tissue capillaries and blood leaving the tissue capillaries

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Breathing and E...

Question 1

Hamburger phenomenon

Bicarbonate shift

Carbonation

Bohr's effect

Question 2

oxyhaemoglobin is a stronger acid which donates hydrogen ion (H+) which in turn displace carbone dioxide from blood

carbaminohaemoglobin is a stronger acid which spilts into hydrogen ion (H+) and bicarbonate (HCO3-)

carbon dioxide reacts with water to form carbonic acid that lowers the pH in tissue

carbon dioxide is less soluble in venous blood than in arterial blood

Question 3

people eat more nutritive food so more RBCs are formed

people get pollution-free air to breathe and more oxygen is available

atmospheric oxygen level is less and hence, more RBCs are needed to absorb the required amount of oxygen to survive

there is more UV radiation which enhances RBC production

Question 4

It is absorbed by leucocytes

It combines with water to form H2CO3 , which neutralised by Na2CO3

In CO2 transport, blood buffers play an important role

It is continuously diffused through the tissues and is not allowed to accumulate

Question 5

increases the affinity of haemoglobin to both oxygen and hydrogen

increases the affinity of haemoglobin to oxygen but decreases its affinity to hydrogen

decreases the affinity of haemoglobin to oxygen but increases its affinity to hydrogen

decreases the affinity of haemoglobin to both oxygen and hydrogen

Question 6

Haemoglobin is necessary for transport of carbon dioxide and carbonic anhydrase for transport of oxygen.

Haemoglobin is necessary for transport of oxygen and carbonic anhydrase for transport of carbon dioxide.

Only oxygen is transported by blood.

Only carbon dioxide is transported by blood.

Question 7

Pulmonary ventilation is equal to alveolar ventilation.

Alveolar ventilation is less than pulmonary ventilation.

Alveolar ventilation is more than pulmonary ventilation.

Pulmonary ventilation is less than alveolar ventilation.

Question 8

More, in alveolar air than in expired air

More in expired air than in alveolar air

More in inspired air than in alveolar air

More in inspired air than in expired air

Question 9

They carry about 20-25 per cent of CO2

They transport 99.5 per cent of O2

They transport about 80 per cent oxygen only and the rest 20 per cent of it is transported in dissolved state in blood-plasma

They do not carry CO2 at all

Question 10

rising PCO2

rising PO2

falling PCO2

falling PO2

Question 11

The contraction of internal intercostal muscles lifts up the ribs and sternum.

The RBCs transport oxygen only.

The thoracic cavity is anatomically an air tight chamber.

Healthy man can inspire approximately 500 mL of air per minute.

Question 12

solubility of gases

thickness of the membranes

pressure gradient

reactivity of the gases

Question 13

Alveolar diffusion of O2 and CO2

Transport of gases by blood

Diffusion of O2 and CO2 between blood and tissues

Utilisation of CO2 by cells for catabolic reactions

Question 14

The curve, is called oxygen dissociation curve.

The part ′A′ represents percentage saturation of haemoglobin with oxygen.

The part 'B' represents partial pressure of carbon dioxide.

This curve is highly useful in studying the effect of factors like PCO2, H+ concentration, etc.

Question 15

Both statements 1 and 2 are correct and statement 2 is the correct explanation of statement 1.

Both statements 1 and 2 are correct but statement 2 is not the correct explanation of statement 1.

Statement 1 is correct and statement 2 is incorrect.

Both statements 1 and 2 are incorrect.

Question 16

CO2 → H2CO3 → HCO3- + H+

CO2 + H2O → CH4 + 2O2

Question 17

oxyhaemoglobin is a stronger acid which donates hydrogen ion (H⁺) which in turn displace carbone dioxide from blood

carbaminohaemoglobin is a stronger acid which spilts into hydrogen ion (H⁺) and bicarbonate (HCO₃^-)

It combines with water to form H₂CO₃ , which neutralised by Na₂CO₃

In CO₂ transport, blood buffers play an important role

They carry about 20-25 per cent of CO₂

They transport 99.5 per cent of O₂

They do not carry CO₂ at all

rising PCO₂

rising PO₂

falling PCO₂

falling PO₂

Alveolar diffusion of O₂ and CO₂

Diffusion of O₂ and CO₂ between blood and tissues

Utilisation of CO₂ by cells for catabolic reactions

This curve is highly useful in studying the effect of factors like PCO₂, H⁺ concentration, etc.

CO₂ → H₂CO₃ → HCO₃^- + H⁺

CO₂ + H₂O → CH₄ + 2O₂

More CO₂ in blood

More O₂ in blood

Less CO₂ in blood

Less O₂ in blood