Tag: transport of respiratory gases

Questions Related to transport of respiratory gases

The mountaineers carry oxygen with them because.

biology the respiratory system factors affecting breathing exchange of gases transport of respiratory gases

  1. At an altitude of more than $5$km there is no air

  2. The amount of air available to a person is less than that available on the ground

  3. The temperature of air is higher than that on the ground

  4. The pressure of air is higher than that on the ground

Show answer
Correct Option: B
Explanation:

The atmospheric pressure goes on decreasing as we go up above the sea level, and the amount of oxygen also decreases at higher altitude. 

So the correct option is 'The amount of air available to a person is less than that available on the ground.'

A condition in which body is deprived of adequate oxygen is called as

biology the respiratory system factors affecting breathing exchange of gases transport of respiratory gases

  1. Hyperventilation

  2. Hypoventilation

  3. Hypoxia

  4. None of the above

Show answer
Correct Option: C
Explanation:
Hypoxia is a condition of absence of enough amount of oxygen in the body tissues to sustain bodily function. This condition can occur due to low concentration of oxygen in the environment or due to inadequate breathing.
So, the correct answer is 'Hypoxia'.

Ravi, who lived at sea level, had around 5 million RBC per cubic millimeter of his blood. Later when he lived at an altitude of 18,000 ft, showed around 8 million RBC per cubic millimeter of blood. This is an adaptation because

biology the respiratory system factors affecting breathing exchange of gases transport of respiratory gases

  1. At high altitude, he ate more nutritive food.

  2. He had pollution free air to balance breathe.

  3. At high altitude O$ _2$ level is less, hence, more RBCs were required to absorb enough oxygen.

  4. At high altitude, there is more UV radiation which enhances RBCs production.

Show answer
Correct Option: C
Explanation:

At sea level, our blood is 98% saturated with oxygen and this decreases to 89% at 3000 metres and reaches as low as 40% on the summit of Everest. Red blood cell production increases, resulting in an increased haemoglobin concentration, which is required to pick up oxygen and transport it around the body. This mechanism enables the body to continue to deliver enough oxygen to each cell, despite the lower oxygen levels. 

When the oxygen supply to the tissues is inadequate, the condition is?

biology the respiratory system factors affecting breathing exchange of gases transport of respiratory gases

  1. Hypoxia

  2. Asphyxia

  3. Pleurisy

  4. Anoxia

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Correct Option: A

Ascent of high mountains may cause altitude sickness in men. Prime cause of this is

biology the respiratory system factors affecting breathing exchange of gases transport of respiratory gases

  1. Excess of O$ _2$ in blood

  2. Decreased efficiency of haemoglobin

  3. Decreased partial pressure of oxygen

  4. Decreased proportion of oxygen in air

Show answer
Correct Option: C
Explanation:

 Altitude sickness (also known as mountain sickness), is caused by gaining altitude too rapidly, which does not allow the body enough time to adjust to reduced oxygen and changes in air pressure, and causes hypobaric hypoxia (a lack of oxygen reaching the tissues of the body).

High percentage of $CO _2$ and very low percentage of $O _2$ may make a person unconscious due to.

biology the respiratory system factors affecting breathing exchange of gases transport of respiratory gases

  1. Eupnoea

  2. Emphysema

  3. Suffocation

  4. Asphyxia

Show answer
Correct Option: D

Read the statements carefully and choose the option representing true statements.
(a) $pO _2$ in the atmospheric air does not change with altiude
(b) Most people who live at high altitude develop polycythemia due to hypoxia
(c) Excess inflation to the lungs is prevented by Hering-Breuer's reflex
(d) While transporting $CO _2$ in blood, blood does not become acidic due to presence of blood buffers.

biology the respiratory system factors affecting breathing exchange of gases transport of respiratory gases

  1. (a) & (c) only

  2. (b) & (c) only

  3. (a), (b) & (c) only

  4. (b), (c) & (d) only

Show answer
Correct Option: D
Explanation:

$pO _2$ of atmospheric air decreases with increasing altitude.

Most people living at high altitude develop polycythemia due to hypoxia as oxygen levels are low.
Hering Breuer's reflex prevent excessive inflation of lungs .
Blood has an efficient buffer system which resists the change in pH even after dissolution of carbon dioxide.
So the correct answer is '(b), (c) & (d) only '.

State whether the following statements are true or false.
The condition in which the body suffers from acute oxygen shortage is called hypoxia.

biology the respiratory system factors affecting breathing exchange of gases transport of respiratory gases

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

Hypoxia is a condition in which the body or a region of the body is deprived of oxygen due to the lack of oxygen supply at the tissue level. It is, therefore, the condition in which the body suffers from acute oxygen shortage. So, the correct option is 'True'.

When the blood contains a high percentage of $CO _2$ and a very low percentage of $O _2$ the breathing stops and the person becomes unconscious. This condition is known as.

biology the respiratory system factors affecting breathing exchange of gases transport of respiratory gases

  1. Suffocation

  2. Asphyxia

  3. Emphysema

  4. Eupnea

Show answer
Correct Option: B
Explanation:

Asphyxia is the extreme condition caused by lack of oxygen and excess of carbon dioxide in the blood, produced by interference with respiration or insufficient oxygen in the air; suffocation. Asphyxia is caused by an injury or obstruction of airway passages. So, the correct answer is option B.

When oxygen supply to tissues is inadequate, the condition is?

biology the respiratory system factors affecting breathing exchange of gases transport of respiratory gases

  1. Dyspnoea

  2. Asphyxia

  3. Hypoxia

  4. Apnoea

Show answer
Correct Option: C