Question

Pressure within the lungs is called
(a) Interpulmonary pressure
(b) Intrapulmonary pressure
(c) Interstitial pressure
(d) Alveolar pressure

Answer 1

Hint: Respiration provides oxygen to tissue and removes carbon dioxide from tissue, respiration involves breathing, exchange of gases, and transportation of gases in the blood. Breathing takes place by inspiration and expiration which depend on lung pressure.

Complete Answer:
The process of breathing involves expansion and contraction of lungs, inspiration takes place when intrapulmonary pressure inside the lung is less than atmospheric pressure which develops negative pressure in lungs with respect to atmospheric pressure and causes entry of air inside the lung, whereas in the case of expiration the Intrapulmonary pressure inside lung increases in comparison atmospheric pressure which cause expiration of air outside the lung.

Additional information:
In inspiration, the diaphragm gets contracted with the rise in the volume of the thoracic cavity, contraction of intercostal muscle lifts up ribs, and sternum which increases the volume of the thoracic chamber. Expiration causes relaxation of diaphragm and contraction of intercostal muscles with relaxation diaphragm and sternum at their normal position. Mammals show negative breathing which allows them to eat and breathe at the same time while eating the air gets entered into the trachea and blocked by epiglottis which prevents entry of food in the trachea.
Breathing involves conditioning and filtration of air in four-step, warming of blood vessel of the nasal chamber, moistening of the nasal chamber by mucus, sterilization kills bacteria with sticky and antiseptic mucus, and cleaning involves trapping of dust particles of passing air.

So, the correct answer is ‘Intrapulmonary pressure’.

Note: In case breathing gets affected by drowsiness, electric shock, and some other factors than artificial breathing techniques used to initiate the breathing of the affected person. The most common artificial breathing technique is mouth-to-mouth resuscitation in which one person blows air inside the mouth of the affected person till the breathing gets initiated.