Breathing and Exchange of Gases Questions

How many ribs are indirectly attached to sternum ?

When there is no air in initial bronchioles, they do not collapse, it is due to :-

Assertion : Exchange part is the site of actual diffusion of O₂ and CO₂ between blood and atmospheric air. Reason : The alveoli (vascularised bag like structure) and their ducts form the exchange part. Alveoli are the primary sites of exchange of gas

Which of the following sequences is correct to initiate inspiration ? I. Intrapulmonary pressure decreases II. Diaphragm contracts III. Air rushes into lungs IV. Volume of thorax increases in the anterior-posterior axis.

Statement-I : During each cardiac cycle two prominent sounds are produced which can be easily heard through a spirometer. Statement-II : The first heart sound (lub) is associated with the closure of the tricuspid and bicuspid valves whereas the secon

A symptom of acute chest pain appears when no enough oxygen is reaching the heart muscle, is called:

The maximum volume of air a person can breathe in after a forced expiration.

Volume of air inspired or expired per breathe during a normal respiration is.

Haemoglobin has least affinity for

Find out the correct match from the following table:-

Given below are two statements :- Statement-I : Mechanisms of breathing vary among different groups of animals depending mainly on their habitats and level of organisation. Statement-II : The process of exchange of O2 from the atmosphere with CO2 pro

In the diagram showing the exchange of gases at the alveolus and the body tissues with blood and transport of carbon dioxide and oxygen, what does the pO₂ and pCO₂ (in mm Hg) represent in blood vessel marked as B?

Choose the correct statement regarding the human respiratory system:

The figure given below shows a small part of human lung where exchange of gas takes place. In which one of the options given below, the one part A, B, C or D is correctly identified along with its function.

Match the Following: (a) Asthma 1. Inflammation of nasal tract(b) Bronchitis 2. Spasm of tracheal muscle/Bronchioles(c) Rhinitis 3. Fully blown out/Damaged alveoli(d) Emphysema 4. Inflammation of bronchi

The rate of breathing is primarily controlled by the concentration of:

The respiratory rhythm centre is located in the:

The enzyme required for the transport of CO2 as bicarbonate is:

Every 100 mL of deoxygenated blood delivers approximately ______ of CO2 to the alveoli.

CO2 is transported in three ways: as carbonic acid, as carbamino-haemoglobin, and as bicarbonates. The percentages are:

The Oxygen Dissociation Curve is:

What factors are favorable for the formation of oxyhemoglobin in alveoli?

Each hemoglobin molecule can carry a maximum of:

About 97% of O2 is transported by ______ in the blood.

In the alveoli, pO2 and pCO2 are respectively:

Partial pressure of Oxygen (pO2) in deoxygenated blood is:

The diffusion membrane is made up of:

Solubility of CO2 is ______ times higher than that of O2.

The primary site of exchange of gases is:

Total Lung Capacity (TLC) is the total volume of air accommodated in the lungs at the end of a forced inspiration. It includes:

Vital Capacity (VC) is equal to:

Residual Volume (RV) is the volume of air remaining in the lungs even after a:

The additional volume of air a person can inspire by a forcible inspiration is:

The volume of air inspired or expired during a normal respiration is called:

Expiration is a passive process that occurs when:

Which of the following helps in increasing the volume of the thoracic chamber?

Inspiration occurs if the pressure within the lungs (intra-pulmonary pressure) is:

Movement of air into and out of the lungs is carried out by a pressure gradient between the:

The steps of respiration are: 1. Diffusion of gases across alveolar membrane 2. Transport of gases by blood 3. Diffusion of O2 and CO2 between blood and tissues 4. Utilization of O2 by cells for catabolic reactions 5. Pulmonary ventilation (breathing

Which of the following is incorrect about human lungs?

Which statement is completely true?

Trachea is a straight tube extending up to the mid-thoracic cavity, which divides at the level of:

Select the correct sequence of different regions of human respiratory tract (air passage):

Carbonic anhydrase role:

Fetal Hb:

Left shift ODC:

Anatomical dead space:

Anaemic hypoxia:

Hering-Breuer reflex:

pCO₂ in tissues: