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(a) How does CO(2) enter the lungs from...

(a) How does `CO_(2)` enter the lungs from blood?

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(a) `CO_(2)` enters the lungs from blood by diffusion due to pressure gradient `(P_(CO_(2))` in pulmonary capillary blood is 46 mm Hg, `P_(CO_(2))` of alveolar air is 40 mm Hg.
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Knowledge Check

  • Bulk of carbon dioxide (CO_(2)) released from body tissues into the blood is present as

    A
    free `CO_(2)` in blood plasma
    B
    `70%` carbamino - haemoglobin in RBCs
    C
    carbamino - haemoglobin in RBCs
    D
    bicarbonate in blood plasma and RBCs

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