Central chemoreceptors in the brain respond to changes in the
1. Oxygen concentration in blood
2. Carbon dioxide concentration in CSF
3. Oxygen concentration in CSF
4. Rate of oxidation of food content in the cell
In which of the following disorders alveolar walls are damaged, surface area for gaseous exchange is reduced and the air sacs remain filled with air even after expiration?
1. Pneumonia
2. Coryza
3. Emphysema
4. SARS
The pO in systemic arteries and systemic veins is respectively
1. 95, 40 mmHg
2. 95, 45 mmHg
3. 40, 95 mmHg
4. 104, 40 mmHg
Mark the incorrect combination with respect to pulmonary capacities
1. IC = TV + IRV
2. FRC = RV + ERV
3. VC = TLC + RV
4. EC = TV + ERV
Which of the following statements are correct with respect to transportation of gases?
A. Blood transport comparatively easily because of its higher solubility
B. diffuses into blood, passes into RBCs and reacts with water to form
C. 20-25 percent is carried by haemoglobin as carbamino-haemoglobin
D. Oxyhaemoglobin of erythrocytes is basic in nature and it increases pH of blood
1. A only
2. A & B only
3. A, B & C only
4. A, B, C & D
Total volume of air a person can expire after a normal inspiration is
A. Tidal volume B. TV + ERV
C. Expiratory capacity D. ERV + RV
1. A only
2. B & C only
3. A, B & C only
4. A,B,C & D
The maximum volume of air a person can breathe in after a forced expiration includes
1. ERV (Expiratory Reserve volume)
2. TV (Tidal Volume)
3. IRV ( Inspiratory Reserve Volume)
4. All of these
Which of the following statements is not correct?
1. Volume of air that will remain in the lungs after a normal expiration is about 2200 ml
2. Partial pressure of and in alveoli is 40 mm Hg and 104 mm Hg respectively
3. Alveoli of lungs are lined by thin squamous epithelium
4. High amount of carbonic anhydrase is found in RBCs
The movement of air into the lungs occurs due to a pressure gradient between the lungs and the atmosphere. So, inspiration occurs when/due to
1. Intra pulmonary is less than the atmospheric pressure
2. Increase in the volume of the thoracic chamber in the dorso-ventral axis
3. Contraction of external inter-costal muscles and phrenic muscles
4. All of these
The diffusion membrane or respiratory membrane does not include
1. Thin squamous epithelium
2. Pseudostratified ciliated epithelium
3. Endothelium
4. Basement membrane