Given below are the partial pressures (in mmHg) of oxygen and carbondioxide at different parts involved in diffusion in comparison to those in atmosphere.

 

Respiratory gas	O2	CO2
Atmospheric air	159	A
Alveoli	B	40
Body (deoxygenated)	40	C
Blood (Oxygenated)	D	40
Tissues	40	45

Choose the correct option with respect to the values of partial pressures (in mmHg) marked as A, B, C and D

	A	B	C	D
1.	0.3	104	40	52
2.	32	116	45	45
3.	0.3	104	45	95
4.	32	116	45	95

 

At 40 mmHg of partial pressure of oxygen haemoglobin is ______ saturated

1. 50 %

2. 75 %

3. 85 %

4. 35 %

Carbon dioxide generated in the tissue is carried in venous blood primarily as

1. Dissolved gas in plasma

2. Carbamino hemoglobin

3. Sodium bicarbonate in venous blood

4. Potassium bicarbonate in venous blood

Given below are four statements A-D each with one or two blanks. Select the option which correctly fills up the blanks in two statements.

A. Healthy man can inspire or expire approximately $\underline{ \left(\mathrm{i}\right) }$ ml of air per minute.

B. Inspiratory reserve volume average $\underline{ \left(\mathrm{i}\right) }$ ml.

C. Residual volume averages $\underline{ \left(\mathrm{i}\right) }$ ml.

D. Volume of air accumulated in the lungs at the end of forced inspiration is $\underline{ \left(\mathrm{i}\right) }$.

Options :

1. A - (i) 500 ml,

    B - (i) 2500 to 3000 ml

2. B - (i) 2500 to 3000 ml,

    C - (i) 1000 ml to 1100 ml

3. C - (i) 1000 ml to 1100 ml

    D - (i) Vital capacity

4. A - (i) 6000 to 8000 ml

    D - (i) Vital capacity + residual volume

Which of the following statement is incorrect with respect to transport of carbon dioxide in blood?

How many of the following statements are correct?

a. Normal exhalation during quiet breathing in an active process involving intensive muscle contraction.

b. Air flow during breathing is due to pressure gradient between the lungs and atmospheric air. 

c. A specialised centre present in the medulla region of the brain called respiratory rhythm centre is primarily responsible for regulation of respiration,

d. Respiratory rate decreases during fever.

1. One

2. Two

3. Three

4. Four 

Vital capacity (VC) can be stated as 

1. TV + IRV

2. TV + FRC

3. IRV + FRC

4. IC + ERV

Why the partial pressure of ${\mathrm{CO}}_2$ is high at tissue-site?

1. Due to the saturation of ${\mathrm{O}}_2$ with Hb

2. Release of ${\mathrm{H}}^{+}$ at the tissue site

3. Due to metabolism

4. Due to the dissociation of ${\mathrm{HbO}}_2$

'Chemosensitive Area' for regulation of respiration is present on ?

1. Medulla

2. Pons

3. Cerebrum

4. Cerebellum

The amount of air that enters the lungs during normal, restful breathing is called the______.

1. Vital capacity

2. Tidal volume

3. Total lung capacity

4. Expiratory reserve volume