General
✓✗Long exposure to dust in stone-breaking industries can cause inflammation leading to
- extra cartilage in bronchi
- increase in vital capacity
- fibrosis of the lungs
- increase in alveolar surface
General
✓✗The process of exchange of O2 from the atmosphere with CO2 produced by the cells is called
- excretion
- breathing
- circulation
- digestion
General
✓✗Match List I with List II.
Choose the correct answer from the options given below.
| List I (structure) | List II (feature) |
| A. Larynx | I. Flap that covers the glottis during swallowing |
| B. Epiglottis | II. Cartilaginous sound box |
| C. Pleura | III. Common passage for food and air |
| D. Pharynx | IV. Double-layered covering of the lungs |
- A-IV, B-I, C-II, D-III
- A-II, B-IV, C-I, D-III
- A-II, B-I, C-IV, D-III
- A-I, B-II, C-IV, D-III
General
✓✗How does the transport of O2 and CO2 by blood happen?
- With the help of platelets and corpuscles
- With the help of RBCs and WBCs
- With the help of WBCs and blood serum
- With the help of RBCs and blood plasma
General
✓✗Every 100 mL of deoxygenated blood delivers about 4 mL of CO2 to the alveoli. For a person whose blood flow through the lungs is 5000 mL per minute, the CO2 delivered per minute is about
- 200 mL
- 20 mL
- 4 mL
- 2000 mL
General
✓✗The pons region of the brain contains the
- chemosensitive area
- respiratory rhythm centre
- pneumotaxic centre
- vomiting centre
General
✓✗Blood leaving the tissues has pO2 = 40 mm Hg and pCO2 = 45 mm Hg. When it reaches the alveoli (pO2 104, pCO2 40), which happens?
- Both gases move out of the blood
- O2 enters the blood and CO2 leaves it
- Neither of the gases moves at all
- Both gases move into the blood
General
✓✗Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): Oxygen plays a major role in the regulation of the respiratory rhythm.
Reason (R): The chemosensitive area is highly sensitive to CO2 and hydrogen ions.
In the light of the above statements, choose the correct answer from the options given below.
Assertion (A): Oxygen plays a major role in the regulation of the respiratory rhythm.
Reason (R): The chemosensitive area is highly sensitive to CO2 and hydrogen ions.
In the light of the above statements, choose the correct answer from the options given below.
- Both Assertion and Reason are true and Reason is the correct explanation of Assertion
- Both Assertion and Reason are true but Reason is not the correct explanation of Assertion
- Assertion is true but Reason is false
- Assertion is false but Reason is true
General
✓✗Skin is an accessory organ of respiration in
- rabbit
- humans
- frog
- lizard
General
✓✗Match List I with List II.
Choose the correct answer from the options given below.
| List I (form of transport) | List II (approximate share) |
| A. O2 bound to haemoglobin | I. 20−25% |
| B. O2 dissolved in plasma | II. 3% |
| C. CO2 as bicarbonate | III. 97% |
| D. CO2 as carbamino-haemoglobin | IV. 70% |
- A-II, B-III, C-IV, D-I
- A-IV, B-II, C-III, D-I
- A-III, B-II, C-I, D-IV
- A-III, B-II, C-IV, D-I
General
✓✗A person living at sea level moves to a high mountain region. To compensate for the lower pO2, the body is expected to
- reduce the breathing rate permanently
- reduce the number of RBCs
- stop producing haemoglobin
- increase the number of RBCs over time
General
✓✗Compared with oxygen, carbon dioxide is transported
- much more in plasma, as bicarbonate
- entirely by haemoglobin inside RBCs
- only in the dissolved form in plasma
- only by the platelets in the blood
General
✓✗Under normal physiological conditions, 100 mL of oxygenated blood can deliver about 5 mL of O2. This means
- all the oxygen in the blood is released at rest
- blood carries only 5 mL of oxygen in total
- only part of the oxygen carried is released at rest
- no oxygen is released at all at rest
General
✓✗In the tissues, more CO2 binds to haemoglobin because
- pCO2 is high and pO2 is low
- pCO2 is low and pO2 is high
- the temperature is low
- carbonic anhydrase is absent
General
✓✗When you hold your breath, which of the following gas changes in blood would first lead to the urge to breathe?
- Falling CO2 concentration
- Rising CO2 and falling O2 concentration
- Falling O2 concentration
- Rising CO2 concentration