Breathing and Exchange of Gases Test 36

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Breathing and Exchange of Gases Test 36

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Weekly Quiz Competition

Question 1
1 / -0

Wind pipe arises from _________.

A
Larynx

B
Nasopharynx

C
Oropharynx

D
Laryngopharynx

Solution

The trachea or windpipe is the tube in air-breathing vertebrates that conducts air from the throat to bronchi. It originates at the caudal end of the larynx and extends into the thoracic cavity, bifurcating distally at the carina to form the primary, extrapulmonary, airways of the lungs.
So the correct answer is option A.
Question 2
1 / -0

Which is not true?

A
$$pCO_2$$ of deoxygenated blood is $$95$$mm Hg

B
$$pCO_2$$ of alveolar air is $$40$$mm Hg

C
$$pO_2$$ alveolar air is $$104$$mm Hg

D
$$pO_2$$ of oxygenated blood is $$95$$mm Hg

E
$$pO_2$$ of deoxygenated blood is $$40$$mm Hg
Question 3
1 / -0

In which disease, due to flattening of tracheal vessels, alveoli are deprived of oxygen?

A
Penumonia

B
Emphysema

C
Asthma

D
Bronchitis

Solution

Asthma is a respiratory disease that is also caused by inflammation of the airways and flattening of the tracheal vessel. It makes breathing hard and alveoli are deprived of oxygen.
So the correct answer is option is C.
Question 4
1 / -0

Which can bind several hundred times more strongly to haemoglobin than oxygen?

A
$$CO_2$$

B
CO

C
$$H_2CO_3$$

D
$$SO_2$$

Solution

CO can bind several hundred times (200-250 times) more strongly to haemoglobin than Oxygen.
So, the correct answer is 'CO'
Question 5
1 / -0

According to Boyle's law, the product of pressure and volume is constant, hence.

A
If volume of lung is increased, the pressure decreases proportionately

B
If volume of lung is increased, the pressure also increases proportionately

C
If volume of lungs is increased, the pressure decreases disproportionately

D
If volume of lungs is increased, the pressure remains the same
Question 6
1 / -0

Bilirubin is formed by breakdown product of

A
Haemoglobin

B
Haemocyanin

C
Haemopoietin

D
Haematin
Question 7
1 / -0

What percentage of $$CO_2$$ is transported by RBCs?

A
$$70\%$$

B
$$20-25\%$$

C
$$7\%$$

D
$$97\%$$

Solution

Nearly 20-25% of carbon dioxide is transported by RBCs whereas 70% of it is carried as bicarbonate. About 7% of carbon dioxide is carried in a dissolved state through plasma.
So, the correct answer is '20−25%'
Question 8
1 / -0

Enzyme essential for transport of $$CO_2$$ as bicarbonate in blood is?

A
Carboxypeptidase

B
Succinic dehydrogenase

C
Carbonic anhydrase

D
Thrombokinase

E
Lactase

Solution

An enzyme present in red blood cells, carbonic anhydrase, aids in the conversion of carbon dioxide to carbonic acid and bicarbonate ions. When red blood cells reach the lungs, the same enzyme helps to convert the bicarbonate ions back to carbon dioxide, which we breathe out.
Hence, the correct answer (C)
Question 9
1 / -0

Oxyhaemoglobin is converted into haemoglobin during the internal respiration because

A
An enzyme splits oxyhaemoglobin

B
Oxygen tension in tissues is less than capillary blood reaching tissues

C
CO$$_2$$ tension is low in blood that reaches tissues

D
Oxyhaemoglobin is unstable

Solution

A small amount of oxygen does dissolve in the blood and is transported in the bloodstream, but it is only about 1.5% of the total amount. The majority of oxygen molecules are carried from the lungs to the body’s tissues by a specialized transport system, which relies on the erythrocyte—the red blood cell. Heme is the portion of hemoglobin that contains iron, and it is heme that binds oxygen. One hemoglobin molecule contains iron-containing heme molecules, and because of this, each hemoglobin molecule is capable of carrying up to four molecules of oxygen. As oxygen diffuses across the respiratory membrane from the alveolus to the capillary, it also diffuses into the red blood cell and is bound by hemoglobin. The following reversible chemical reaction describes the production of the final product, oxyhemoglobin (Hb–O2), which is formed when oxygen binds to hemoglobin.
So, the correct option is 'Oxygen tension in tissues is less than capillary blood reaching tissues'.
Question 10
1 / -0

Amount of Oxygen carried by $$100$$ml arterial blood while passing through tissues is?

A
$0.4 - 0.6$$ml

B
$$4 - 6$$ml

C
$$14 - 15$$ml

D
$$19 - 20$$ml

Solution

100 mL arterial blood carries about 19-20 mL of Oxygen but it delivers 4-6 mL of Oxygen at tissue level in normal conditions.
Hence the correct answer is (D)

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Breathing and Exchange of Gases Test 36

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Breathing and Exchange of Gases Test 36

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Question 1

Larynx

Nasopharynx

Oropharynx

Laryngopharynx

Solution

Question 2

$$pCO_2$$ of deoxygenated blood is $$95$$mm Hg

$$pCO_2$$ of alveolar air is $$40$$mm Hg

$$pO_2$$ alveolar air is $$104$$mm Hg

$$pO_2$$ of oxygenated blood is $$95$$mm Hg

$$pO_2$$ of deoxygenated blood is $$40$$mm Hg

Question 3

Penumonia

Emphysema

Asthma

Bronchitis

Solution

Question 4

$$CO_2$$

CO

$$H_2CO_3$$

$$SO_2$$

Solution

Question 5

If volume of lung is increased, the pressure decreases proportionately

If volume of lung is increased, the pressure also increases proportionately

If volume of lungs is increased, the pressure decreases disproportionately

If volume of lungs is increased, the pressure remains the same

Question 6

Haemoglobin

Haemocyanin

Haemopoietin

Haematin

Question 7

$$70\%$$

$$20-25\%$$

$$7\%$$

$$97\%$$

Solution

Question 8

Carboxypeptidase

Succinic dehydrogenase

Carbonic anhydrase

Thrombokinase

Lactase

Solution

Question 9

An enzyme splits oxyhaemoglobin

Oxygen tension in tissues is less than capillary blood reaching tissues

CO$$_2$$ tension is low in blood that reaches tissues

Oxyhaemoglobin is unstable

Solution

Question 10

$0.4 - 0.6$$ml

$$4 - 6$$ml

$$14 - 15$$ml

$$19 - 20$$ml

Solution

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