Breathing and Exchange of Gases Test 44

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Breathing and Exchange of Gases Test 44

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following is not a respiratory exchange surface?

A
Air sacs of birds

B
Skin of amphibians

C
Gills of larval amphibians

D
Alveoli of mammals

Solution

The air sacs of birds are involved in respiration but are not directly involved in the exchange of gases, while the skin of amphibians, gills of larvae & alveoli are involved in respiration.
So, the correct option is 'Air sacs of birds'.
Question 2
1 / -0

Choose the correct answer from the alternatives given.
When carbon dioxide binds to haemoglobin, which of the following compounds is formed?

A
Carbonic acid

B
Hydrogencarbonate ions

C
Oxyhaemoglobin

D
Carbaminohaemoglobin

Solution

When carbon dioxide binds to hemoglobin, carbaminohaemoglobin is formed. One molecule of hemoglobin can bind to four molecules of carbon dioxide and therefore can transport 4 molecules of carbon dioxide. So, the correct option is 'Carbaminohaemoglobin'.
Question 3
1 / -0

The release of oxygen by haemoglobin for use in body tissues is dependent on all of the following

A
low $$PO_2$$ of body tissue cells

B
alkaline pH of blood in tissue capillaries

C
presence of ATP

D
all of the above cause the release of oxygen from haemoglobin

Solution

The release of oxygen by hemoglobin for use in body tissues is dependent on the low partial pressure of oxygen in tissue.
So, the correct option is 'low
PO$$_2$$of body tissue cells'.
Question 4
1 / -0

Choose the correct answer from the alternatives given.
The amount of air that enters lungs during normal respiration is

A
tidal volume

B
vital capacity

C
total lung capacity

D
inspiratory capacity

Solution

The amount of air which enters the lungs during normal inhalation at rest is known as the tidal volume. The average tidal volume is 500ml. So, the correct option is 'tidal volume'.
Question 5
1 / -0

In negative pressure breathing, inhalation results from:

A
forcing air from the throat down into the lungs

B
contracting the diaphragm

C
relaxing the muscles of the rib cage

D
contracting the abdominal muscles

Solution

During the process of inhalation, the lung volume expands as a result of contraction of the diaphragm & intercostal muscles, thoracic cavity expands, due to this increase in volume, the pressure is decreased.
So, the correct option is 'contracting the diaphragm'.
Question 6
1 / -0

Which of the following reactions prevails in red blood cells travelling through pulmonary capillaries?

A
$$Hb \, + \, 4O_2 \, \rightarrow \, Hb(O_2)_4$$

B
$$Hb(O_2)_4 \, \rightarrow \, Hb \, + \, 4O_2$$

C
$$H_2CO_3 \, \rightarrow \, H^+ \, + \, HCO^-_3$$

D
$$Hb \, + \, (CO_2)_4 \, \rightarrow \, Hb(CO_2)_4$$

Solution

One hemoglobin molecule can bind four molecules of oxygen, so four molecules of oxygen are required to form oxyhemoglobin.
So, the correct option is A.
Question 7
1 / -0

How many organisms in the list given below respire through gills?
Earthworm, Frog, Fish, Insects, Snake, Prawn, and Flatworm

A
Three

B
Six

C
Two

D
Four
Solution
- A gill is a respiratory organ found in many aquatic organisms that extract dissolved oxygen from water and excretes carbon dioxide.
- The aquatic arthropods like prawns, fishes and frogs when underwater respire through gills.
- Earthworms have moist skin, Insects have trachea, and snakes have lungs for respiration.
- Flatworms also respire through the skin like earthworms.
So, the correct answer is option A.
Question 8
1 / -0

What will happen when a person stop his breathing only for few seconds ?

A
Concentration of $$CO_{2}$$ and $$H^{+}$$ increased in atrial blood.

B
Chemosensitive area situated adjacent to rhythm centre gets activated.

C
Oxygen dissociation curve shift towards right.

D
All are correct

Solution

If a person stops breathing, carbon dioxide will continue to accumulate in the blood as it will not be released by exhalation. Rising levels of carbon dioxide signal the body to breathe and ensure our unconscious and autonomous respiration. Involuntary control of breathing is regulated by the respiratory centre of the brain. It is located in the medulla near the rhythm centre. The increase in carbon dioxide causes carbon dioxide to dissolve with water in the blood, forming carbonic acid. This results in an increased H- ion concentration and a reduced pH. This also results in a shift in the oxygen dissociation curve towards the right. So, the correct option is 'All are correct'.
Question 9
1 / -0

Majority of Carbon dioxide is brought by blood from the tissue cells in the form of _________ in the blood plasma.

A
Carbonic acid

B
Potassium and sodium bicarbonate

C
Sodium and potassium carbonate

D
Carbamino haemoglobin
Solution
Carbon dioxide is transported in the blood from the tissue to the lungs in three ways:
Dissolved in solution
Buffered with water as carbonic acid
Bound to proteins, particularly hemoglobin.
So, the correct option is 'Carbonic acid'.
Question 10
1 / -0

Amount of $${CO}_{2}$$ delivered by every 100 ml of deoxygenated blood is

A
7 ml

B
5 ml

C
4 ml

D
27 ml

Solution

Transport of carbon dioxide is carried by haemoglobin in the form of carbaminohaemoglobin. the binding is affected by the partial pressure of the gas. In tissues, the partial pressure of carbon dioxide is more, therefore, haemoglobin binds with it. In alveoli when the partial pressure of oxygen increases, Hb dissociates from carbon dioxide and binds with oxygen.
Every 100 ml of deoxygenated blood delivers approximately 4 ml of carbon dioxide gas.
So, the correct option is '4 ml'.

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Breathing and Exchange of Gases Test 44

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Breathing and Exchange of Gases Test 44

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SHARING IS CARING

Question 1

Air sacs of birds

Skin of amphibians

Gills of larval amphibians

Alveoli of mammals

Solution

Question 2

Carbonic acid

Hydrogencarbonate ions

Oxyhaemoglobin

Carbaminohaemoglobin

Solution

Question 3

low $$PO_2$$ of body tissue cells

alkaline pH of blood in tissue capillaries

presence of ATP

all of the above cause the release of oxygen from haemoglobin

Solution

Question 4

tidal volume

vital capacity

total lung capacity

inspiratory capacity

Solution

Question 5

forcing air from the throat down into the lungs

contracting the diaphragm

relaxing the muscles of the rib cage

contracting the abdominal muscles

Solution

Question 6

$$Hb \, + \, 4O_2 \, \rightarrow \, Hb(O_2)_4$$

$$Hb(O_2)_4 \, \rightarrow \, Hb \, + \, 4O_2$$

$$H_2CO_3 \, \rightarrow \, H^+ \, + \, HCO^-_3$$

$$Hb \, + \, (CO_2)_4 \, \rightarrow \, Hb(CO_2)_4$$

Solution

Question 7

Three

Six

Two

Four

Solution

Question 8

Concentration of $$CO_{2}$$ and $$H^{+}$$ increased in atrial blood.

Chemosensitive area situated adjacent to rhythm centre gets activated.

Oxygen dissociation curve shift towards right.

All are correct

Solution

Question 9

Carbonic acid

Potassium and sodium bicarbonate

Sodium and potassium carbonate

Carbamino haemoglobin

Solution

Question 10

7 ml

5 ml

4 ml

27 ml

Solution

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