Breathing and Exchange of Gases PYQs

In humans, respiration occurs in the following steps. Arrange these steps in the correct order: A. Diffusion of O₂ and CO₂ between blood and tissues B. Diffusion of O₂ and CO₂ across alveolar membrane C. Pulmonary ventilation by which atmospheric air is drawn in and CO₂ rich alveolar air is released out D. Cellular respiration E. Transport of gases by the blood Choose the correct answer from the options given below:

Match List-I with List-II. Choose the correct answer from the options given below :

Which of the following factors are favourable for the formation of oxyhaemoglobin in alveoli?

Match List I with List II : Choose the correct answer from the options given below:

Which of the following is not the function of conducting part of respiratory system?

Under normal physiological conditions in human beings every 100 ml of oxygenated blood can deliver ______ ml of O₂ to the tissues.

The partial pressures (in mm Hg) of oxygen (O₂) and carbon dioxide (CO₂) at alveoli (the site of diffusion) are:

Select the favourable conditions required for the formation of oxyhaemoglobin at the alveoli.

Identify the wrong statement with reference to transport of oxygen

Select the correct events that occur during inspiration. (a) Contraction of diaphragm (b) Contraction of external inter-costal muscles (c) Pulmonary volume decreases (d) Intra pulmonary pressure increases

Select the correct statement.

The maximum volume of air a person can breathe in after a forced expiration is known as:

Which of the following options correctly represents the lung conditions in asthma and emphysema, respectively?

Match the items given in Column I with those in Column II and select the correct option given below:

Lungs are made up of air-filled sacs the alveoli. They do not collapse even after forceful expiration, because of:

The partial pressure of oxygen in the alveoli of the lungs is

Lungs do not collapse between breaths and some air always remains in the lungs which can never be expelled because

Name the pulmonary disease in which alveolar surface area involved in gas exchange is drastically reduced due to damage in the alveolar walls.

Approximately seventy percent of carbon dioxide absorbed by the blood will be transported to the lungs:

The figure shows a diagrammatic view of human respiratory system with labels A, B, C and D. Select the option which gives correct identification and main function and/or characteristic.

Which one of the following is a possibility for most of us in regard to breathing, by making a conscious effort?

Bulk of carbon dioxide $CO_2$ released from body tissues into the blood is present as:

What is vital capacity of our lungs?

The haemoglobin of a human foetus

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

Which one of the following statements is incorrect?

The majority of carbon dioxide produced by our body cells is transported to the lungs: