Question

Fill in the blanks.

a. Breathing involves two stages:
......1...... during which atmospheric air is drawn in and
......2...... by which alveolar air is released out.

b. The movement of air into and out of the lungs is carried out by ......3...... gradient between the lungs and the atmosphere.

c. Inspiration can occur if the pressure within lungs is ....4.... than the atmospheric pressure i.e., there is a ....5..... pressure in the lungs with respect to atmospheric pressure.

d. Expiration takes place when the intrapulmonary pressure is ....6.... than atmospheric pressure.

• A. 1-inspiration,2-expiration, 3-pressure, 4-higher, 5-positive, 6-lower
• B. 1- inspiration, 2- expiration, 3- pressure, 4-lower, 5-negative, 6-higher
• C. 1-inspiration, 2-expiration, 3-pressure, 4-higher, 5-negative, 6- lower
• D. 1-expiration, 2-inspiration, 3-concentration, 4-lower, 5- positive, 6- higher

Answer 1

The correct option is B 1- inspiration, 2- expiration, 3- pressure, 4-lower, 5-negative, 6-higher

Statement a

Breathing involves two stages:
$\underset{–}{Inspiration}$ during which atmospheric air is drawn in and $\underset{–}{expiration}$ by which alveolar air is released out.

Statement b

The movement of air into and out of the lungs is carried out by $\underset{–}{Pressure}$ gradient between the lungs and the atmosphere.

Statement c

Inspiration can occur if the pressure within lungs is $\underset{–}{lower}$ than the atmospheric pressure i.e., there is a $\underset{–}{negative}$ pressure in the lungs with respect to atmospheric pressure.

Statement d

Expiration takes place when the intrapulmonary pressure is $\underset{–}{higher}$ than atmospheric pressure.