Critical minimum value of mitochondrial pO₂ required is

1. 0.8–2 mm Hg

2. 2–5 mm Hg

3. 0.5–3 mm Hg

4. 3–5 mm Hg

In the brain, loss of function occurs within how much time of sudden loss of O₂ supply

1. 10–16s

2. 5–8s

3. 15–20s

4. 40–45s

Vital capacity of the lung is

1. FRC+TV

2. TLC-FRC

3. FRC-RV

4. TLC-RV

Phrenic nerve roots are

1. C4, C5, C6

2. C2, C3, C4

3. C3, C4, C5

4. None of the above

At rest, breathing air at sea level, after how much time the pO₂ of alveolar gas and blood in pulmonary capillaries become equal.

1. 0.25s

2. 0.50s

3. 0.75s

4. 1s

Solubility of O₂ in blood in ml/L blood/mm Hg

1. 0.3

2. 0.03

3. 0.003

4. 0.0003

“Clo” value is use for measurement of

1. Clothing insulation

2. Wind velocity

3. Radiant heat

4. Humidity

5. None of the above

According to FITS, caution zone lies between

1. 30–32°C

2. 32–36°C

3. 32–38°C

4. 36–38°C

5. 38–40°C

Loss of sensation occurs in which degree of frostbite

1. Third degree

2. First degree

3. Second degree

4. Fourth degree

For each cm above heart level, pressure within artery is reduced by

1. 0.68 mm Hg

2. 0.78 mm Hg

3. 0.87 mm Hg

4. None of the above

Baroreceptors are located inside

1. Aortic arch and carotid body

2. Aortic body and carotid sinus

3. Aortic arch and carotid sinus

4. None of the above

The following points regarding Haldane effect are correct, except

1. Occurs at tissue level

2. Occurs at the level of lungs

3. Release of O₂

4. Release of CO₂

During continuous PPB, which of the following decreases

1. ERV

2. IRV

3. RV

4. All of the above

Physiological requirements of oxygen system is/are

1. Appropriate temperature

2. Minimal resistance

3. Disposal of expirate

4. Safety pressure

The relationship between resistance(R) and radius(r) of airway is

1. R α r²

2. R α r⁴

3. R α 1/r³

4. R α 1/r⁴