Which of the following best indicates the sequence of oxygen flow though the parts of the respiratory and circulatory systems?

a. veins, trachea, lung capillaries, alveoli
b. trachea, alveoli, lung capillaries, arteries
c. lung capillaries, trachea, veins, alveoli
d. trachea, arteries, alveoli, lung capillaries

The correct answer is -

B. trachea, alveoli, lung capillaries, arteries.

Explanation:

During respiration, atmospheric oxygen is taken in through nostril, after which it travels the respiratory route that is nostrils, followed by pharynx, trachea, bronchus and smaller branches of bronchial tree and then into the alveolus.

The oxygen is passed to lung capillaries from alveoli, which is then passed to pulmonary artery that picks up oxygen from lungs and releases carbon dioxide to be exhaled out.

Thus, option B) is the right answer.

answer is a

explanation:

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