NCERT Class 11 Science — Chapter 4: Breathing and Exchange of Gases

The cartilaginous box helping in sound production is the:

In a clinical setting, which capacity would be most informative to assess a patient’s maximal ventilatory performance?

Which pleural membrane is in close contact with the thoracic lining?

Which capacity is the sum of tidal volume and expiratory reserve volume?

Every 100 mL of oxygenated blood delivers approximately how much oxygen to the tissues under normal physiological conditions?

Which instrument is used to measure respiratory volumes?

With reference to gas exchange mechanisms among animals, consider the following statements: 1. Insects rely on gills for respiration. 2. Most aquatic arthropods depend on vascularised bags for respiration. 3. Most aquatic arthropods depend on gills for respiration. Which of the statements given above are correct?

At which vertebral level does the human trachea bifurcate into the primary bronchi?

Assertion (A): An increase in the volume of the thoracic cavity causes a similar increase in the pulmonary volume. Reason (R): We can directly alter the pulmonary volume by contracting the smooth muscles of the lungs.

Which combination is favourable for carbamino-haemoglobin dissociation at the alveolus?

Which group of animals primarily uses a system of tracheal tubes for respiration?

Consider the following statements about the larynx and epiglottis in humans: 1. Larynx is a cartilaginous box associated with sound production. 2. Epiglottis facilitates the entry of food into the larynx. 3. Epiglottis is a fibrous flap devoid of elasticity. Which of the statements given above is/are correct?

Consider the following about diffusion of gases in the lungs: 1. It is driven mainly by partial pressure gradients. 2. Solubility of gases has no effect on the rate. 3. Membrane thickness influences the rate of diffusion. Which of the statements given above is/are correct?

Which one of the following instruments is used for clinical assessment of pulmonary volumes?

In the thoracic cavity, which structure forms the inferior boundary essential for ventilation mechanics?

Which capacity is defined as the total volume of air that remains in the lungs after a normal expiration?

Peripheral receptors associated with which blood vessels can detect changes in CO2 and H+ for respiratory control?

Every 100 mL of deoxygenated blood delivers approximately how much carbon dioxide to the alveoli?

Which of the following pathways accounts for the majority of carbon dioxide transport in blood?

Which enzyme predominantly present in RBCs catalyses the reversible formation of bicarbonate from carbon dioxide and water?

Consider the following statements: 1. Exchange of gases occurs only at alveoli and not at tissues. 2. Diffusion depends on partial pressure gradients and membrane thickness. Which of the statements given above is/are correct?

Match the respiratory disorder/factor with its feature: List I | List II A. Asthma | 1. Major cause of Emphysema B. Emphysema | 2. Fibrosis due to dust exposure C. Silicosis (Occupational disorder) | 3. Alveolar wall damage reducing respiratory surface D. Cigarette smoking | 4. Inflammation of bronchi and bronchioles Select the correct answer using the code given below

The Organ of Corti is located on which membrane within the cochlea?

The fluid present between the two pleural membranes that reduces friction on the lung surface is:

The vascularised bag-like structures at the ends of bronchioles where gas exchange occurs are:

Which respiratory disorder is characterised by damaged alveolar walls and a decrease in respiratory surface area?

Approximately what percentage of carbon dioxide is transported in the blood as bicarbonate?

A single molecule of haemoglobin can carry a maximum of how many molecules of oxygen?

The primary respiratory rhythm centre is located in the:

Which structure in the inner ear is responsible for converting sound vibrations into neural signals?