Which of the following statements correctly d | vedclass

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(D) In the lungs,the partial pressure of $CO_{2}$ is lower in the alveoli than in the blood,causing $CO_{2}$ to diffuse out of the blood.Specifically,

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All of the above.

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(D) In the lungs,the partial pressure of $CO_{2}$ is lower in the alveoli than in the blood,causing $CO_{2}$ to diffuse out of the blood.Specifically,bicarbonate ions $(HCO_{3}^{-})$ in the plasma enter the erythrocytes and combine with $H^{+}$ ions to form carbonic acid $(H_{2}CO_{3})$.Carbonic acid is then broken down by the enzyme carbonic anhydrase into $H_{2}O$ and $CO_{2}$.This $CO_{2}$ diffuses from the blood into the alveoli and is subsequently exhaled during expiration.This process is the inverse of the reactions occurring in the systemic tissues,where $CO_{2}$ is loaded into the blood.

Column-$I$	Column-$II$
$i$. Cellular respiration	$a$. Exchange of gases $O_2$ and $CO_2$ between blood and tissue cells.
$ii$. Breathing	$b$. Physical process of gaseous exchange between atmospheric air and lungs.
$iii$. Internal respiration	$c$. Gaseous exchange between alveolar air and blood capillaries.
$iv$. External respiration	$d$. Food is oxidized and $ATP$ is generated.

Which of the following statements correctly describes the respiratory processes occurring in the lungs?

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