Breathing and Exchange of Gases Test 39

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Breathing and Exchange of Gases Test 39

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Question 1
1 / -0

Which of the following is the most appropriate in normal circumstances?

A
During inspiration the intrapulmonary pressure is less than the atmospheric pressure

B
During expiration the intrapulmonary pressure is less than the atmospheric pressure

C
During inspiration the intrapulmonary pressure is more than the atmospheric pressure

D
During expiration the intrapulmonary pressure is equal to atmospheric pressure
Question 2
1 / -0

Number of alveoli present in human lungs is?

A
$$7-10$$ million

B
$$70-100$$ million

C
$$300-400$$ million

D
$$800-1000$$ million
Question 3
1 / -0

A molecule of haemoglobin can carry atoms of oxygen.

A
$$2$$

B
$$4$$

C
$$6$$

D
$$8$$
Question 4
1 / -0

Although blood caries a lot of $$CO_2$$, it does not become acidic due to _______.

A
$$CO_2$$ combines with water to form $$H_2CO_3$$, which is neutralised by $$Na_2CO_3$$

B
In $$CO_2$$ transport blood buffers play an important part

C
$$CO_2$$ is absorbed by leucocytes

D
$$CO_2$$ continuously diffuses through tissues and does not accumulate

Solution

Sodium bicarbonate (a buffer), present in blood, plays an important role in carbon dioxide transportation. During carbon dioxide transportation, carbonic acid is formed. Carbonic acid dissociates in hydrogen ion and bicarbonate ion. This bicarbonate ion combines with sodium and forms sodium bicarbonate. Thus the concentration of carbonic acid does not increase in blood.
So, the correct answer is "In $$CO_2$$ transport blood buffers play an important role".
Question 5
1 / -0

Identify correct statement regarding transport of respiratory gases through blood

A
Only oxygen is transported

B
Only $$CO_2$$ is transported

C
Haemoglobin is necessary for transport of $$O_2$$ and carbonic anhydrase for $$CO_2$$

D
Haemoglobin is necessary for transport of $$CO_2$$ and carbonic anhydrase for $$O_2$$.

Solution

C. Haemoglobin is necessary for transport of O2 and carbonic anhydrase for CO2
Solution: The main respiratory gases are oxygen and carbon dioxide. Oxygen is transported by attaching with the haemoglobin in RBCs. Carbonic anhydrase is an enzyme that assists in rapid inter-conversion of carbon dioxide and water in carbonic acid, hydrogen ions and bicarbonate ions. Majority of the carbon dioxide in blood are transported in the form of bicarbonate ions.
So the correct answer is "Haemoglobin is necessary for transport of O2 and carbonic anhydrase for CO2."
Question 6
1 / -0

For analysis, the blood drawn from a patient will not be placed in a tube having

A
Sodium oxalate

B
Heparin

C
Calcium bicarbonate

D
Being chilled

Solution

Solution: The blood should not clot or coagulate during analysis. Sodium oxalate, heparin and being chilled act as anti-coagulating agent. But calcium bicarbonate can coagulate blood.
So the correct answer is "Calcium bicarbonate".
Question 7
1 / -0

Volume of air inspired and expired with each normal breath is known as

A
Residual Volume (RV)

B
Total Lung Capacity (TLC)

C
Vital Capacity (VC)

D
Tidal Volume (TV)

Solution

Tidal Volume is the normal volume of air displaced between normal inhalation and exhalation when extra effort is not applied. It is approx 500ml. Thus the correct answer is option D.
Question 8
1 / -0

Pulmonary trunk and aorta are attached by

A
Chordae tendinae

B
Ligamentum arteriosus

C
Coronary sulcus

D
Pericardium.

Solution

B. Ligamentum arteiosus
Solution: Chordace tendinae is a connective tissue that connects the papillary musscles to the tricuspid valve and mitral valve.
Ligamentum arteriosus attaches pulmonary trunk and aorta.
Coronary sulcus separates atria from ventricles.
Pericardium is the fibrous sac that encloses the heart.
So the correct answer is "Ligamentum arteiosus".
Question 9
1 / -0

Which option is completely correct for the given statements?
Statement 1 - The nerve impulse ordered by respiratory centre passes through nerve to the diaphragm and the intercostal muscles and regulates respiration.
Statement 2 - Respiratory centre located in brain stem gives off rythmic stimuli to diaphragm and respiratory muscle and regulate respiration.

A
First statement is wrong and second statement is correct

B
First statement is correct and second statement is wrong

C
Both of the statements are wrong

D
Both of the statements are correct

Solution

Rhythmic nerve impulses generated from the the inspiratory center of the medulla oblongata in the brain pass through the nerve and stimulate the diaphragm and intercostal thereby regulating the respiration. Thus, the correct option is D.
Question 10
1 / -0

Gaseous exchange in birds occurs in

A
Lungs

B
Air sacs

C
Bronchi

D
Sacchobronchi

Solution

Birds have lungs, but they also have air sacs. Depending upon the species, the bird has seven or nine air sacs. The air sacs of birds extend into the humerus (the bone between the shoulder and elbow), the femur (the thigh bone), the vertebrae and even the skull.
So the correct answer is 'Air sacs'.

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Breathing and Exchange of Gases Test 39

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Breathing and Exchange of Gases Test 39

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Question 1

During inspiration the intrapulmonary pressure is less than the atmospheric pressure

During expiration the intrapulmonary pressure is less than the atmospheric pressure

During inspiration the intrapulmonary pressure is more than the atmospheric pressure

During expiration the intrapulmonary pressure is equal to atmospheric pressure

Question 2

$$7-10$$ million

$$70-100$$ million

$$300-400$$ million

$$800-1000$$ million

Question 3

$$2$$

$$4$$

$$6$$

$$8$$

Question 4

$$CO_2$$ combines with water to form $$H_2CO_3$$, which is neutralised by $$Na_2CO_3$$

In $$CO_2$$ transport blood buffers play an important part

$$CO_2$$ is absorbed by leucocytes

$$CO_2$$ continuously diffuses through tissues and does not accumulate

Solution

Question 5

Only oxygen is transported

Only $$CO_2$$ is transported

Haemoglobin is necessary for transport of $$O_2$$ and carbonic anhydrase for $$CO_2$$

Haemoglobin is necessary for transport of $$CO_2$$ and carbonic anhydrase for $$O_2$$.

Solution

Question 6

Sodium oxalate

Heparin

Calcium bicarbonate

Being chilled

Solution

Question 7

Residual Volume (RV)

Total Lung Capacity (TLC)

Vital Capacity (VC)

Tidal Volume (TV)

Solution

Question 8

Chordae tendinae

Ligamentum arteriosus

Coronary sulcus

Pericardium.

Solution

Question 9

First statement is wrong and second statement is correct

First statement is correct and second statement is wrong

Both of the statements are wrong

Both of the statements are correct

Solution

Question 10

Lungs

Air sacs

Bronchi

Sacchobronchi

Solution

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