NEET PG DENTAL EXAM

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EMBRYOLOGY

RESPIRATORY SYSTEM

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
____, which is a waste gas (useless gas), exits the bloodstream and enters the lungs. This gas is then breathed out with the rest of the other gases.
A
Oxygen
B
Carbon Dioxide
C
Either A or B
D
None of the above
Explanation: 

Detailed explanation-1: -At the same time, a waste gas called carbon dioxide moves from your blood to your lungs and is expelled.

Detailed explanation-2: -Gas exchange takes place in the millions of alveoli in the lungs and the capillaries that envelop them. As shown below, inhaled oxygen moves from the alveoli to the blood in the capillaries, and carbon dioxide moves from the blood in the capillaries to the air in the alveoli.

Detailed explanation-3: -Some amount of inspired air in the alveoli does not participate in gas exchange. This happens as some alveoli due to 908various reasons have little or no blood supply. Therefore, air in these alveoli also becomes part of the wasted air. The volume of air in these alveoli is referred to as alveolar dead space.

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