NEET Biology question

BiologyBreathing and Exchange of GasesNEET

Consider the following statements each with two blanks. (i) Actually, only about (1) mL of air enters the lung's alveoli for the exchange of gases. The remaining fills the respiratory passage and is termed (2). (ii) The amount of air which one can inhale with maximum effort and also exhale with maximum effort is termed as (3). It is about (4) in a normal adult person. (iii) During normal quiet breathing, on an average, approximately (5) mL of air is inspired or expired by an adult human male in each breath. It is termed the (6) volume. Which of the following options gives the correct fill ups for the respective blank numbers from (1) to (6) in the above statements?

Answer: (A)

Solution

Only about 350 mL of the 500 mL tidal volume actually reaches the alveoli, the remainder (150 mL) filling the dead (air) space of the conducting passages; the maximal volume inhaled and exhaled with full effort is the vital capacity, roughly 4000-4600 mL; and the normal, unforced

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Question ID VK-119284