General
✓✗After a period of very rapid deep breathing (which removes a lot of CO2), breathing may slow for a while because
- the high O2 level stops the heart for a while
- the lungs fill with water after deep breathing
- the diaphragm becomes paralysed for some time
- low CO2 weakly stimulates the chemosensitive area
General
✓✗Wheezing in asthma is due to
- damage to the walls of alveoli
- fibrosis of the lung tissue
- inflammation of bronchi and bronchioles
- fluid collecting in the pleural cavity
General
✓✗Insects can deliver air directly to their cells because they have
- gills in the abdomen
- haemoglobin in the tracheae
- a network of tracheal tubes
- lungs with alveoli
General
✓✗Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): Emphysema reduces the efficiency of gas exchange.
Reason (R): In emphysema, the alveolar walls are damaged and the respiratory surface decreases.
In the light of the above statements, choose the correct answer from the options given below.
Assertion (A): Emphysema reduces the efficiency of gas exchange.
Reason (R): In emphysema, the alveolar walls are damaged and the respiratory surface decreases.
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
- Both Assertion and Reason are false
General
✓✗Compared with blood entering the alveolar capillaries, blood leaving them has
- a lower pO2 and a lower pCO2
- a lower pO2 and a higher pCO2
- the same pO2 and pCO2
- a higher pO2 and a lower pCO2
General
✓✗The alveoli and their ducts form the
- respiratory or exchange part
- food passage of the pharynx
- sound-producing part of the tract
- conducting part of the system
General
✓✗The percentage of O2 carried in the dissolved state in plasma is about
- 97%
- 70%
- 3%
- 20%
General
✓✗In humans, the nasal chamber opens into the
- trachea
- pharynx
- larynx directly
- oesophagus
General
✓✗Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): High pCO2 and high H+ concentration in tissues favour release of oxygen.
Reason (R): These conditions increase the affinity of haemoglobin for oxygen.
In the light of the above statements, choose the correct answer from the options given below.
Assertion (A): High pCO2 and high H+ concentration in tissues favour release of oxygen.
Reason (R): These conditions increase the affinity of haemoglobin for oxygen.
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
- Both Assertion and Reason are false
General
✓✗Carbon dioxide is transported from the tissues to the respiratory surface by
- erythrocytes only
- plasma only
- plasma and erythrocytes
- erythrocytes and leucocytes
General
✓✗At rest, which of the following has the lowest pO2?
- Oxygenated blood (95 mm Hg)
- Atmospheric air (159 mm Hg)
- Alveolar air (104 mm Hg)
- Tissues (40 mm Hg)
General
✓✗Which pair correctly matches the condition with its effect on oxyhaemoglobin?
- Low temperature - dissociation
- Low pCO2 - dissociation
- High pO2 - dissociation
- High H+ concentration - dissociation
General
✓✗Which of the following are correct about the diffusion membrane?
A. It has three major layers.
B. It includes the endothelium of alveolar capillaries.
C. It includes the pleura.
D. Its thickness is much less than a millimetre.
Choose the correct answer from the options given below.
A. It has three major layers.
B. It includes the endothelium of alveolar capillaries.
C. It includes the pleura.
D. Its thickness is much less than a millimetre.
Choose the correct answer from the options given below.
- A, B and C only
- C and D only
- A, B and D only
- A, B, C and D
General
✓✗The red colour of blood is due to
- platelets
- bicarbonate
- plasma proteins
- haemoglobin
General
✓✗Vital capacity of the lungs is
- IRV + ERV + TV − RV
- IRV + ERV
- IRV + ERV + TV + RV
- IRV + ERV + TV