Q.Total lung capacity is ______.

Vital capacity is the total exchangeable air volume — maximum inspiration possible after maximal (forceful) expiration.

Human respiratory (lung) volumes and capacities are defined relative to normal, quiet breathing. Vital capacity (VC) is the maximum volume of air a person can breathe in after a forced (maximal) expiration — equivalently, it is also the maximum volume that can be forcibly expelled after a forceful inspiration. It is the sum of the Expiratory Reserve Volume (ERV) + Tidal Volume (TV) + Inspiratory Reserve Volume (IRV), and represents nearly the entire usable lung capacity excluding the residual volume that always remains in the lungs.

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The average tidal volume is about 500 ml, so the answer is (B).

Tidal volume (TV) is the volume of air inspired or expired during a single normal (quiet) breath. In a healthy adult it is about 500 mL. With a breathing rate of about 12-16 per minute, this means roughly 6000-8000 mL of air is moved per minute.

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The air left in the lungs after forceful expiration is the residual volume, so the answer is (B).

Definitions of the relevant lung volumes:

• Tidal volume — air moved in one normal breath (about 500 mL).
• Expiratory reserve volume — extra air that can be expired after a normal expiration.
• Residual volume — the air that still remains in the lungs even after the most forceful expiration (about 1100-1200 mL); it keeps the alveoli partly inflated. …

The air left in the lungs even after a forcible expiration is the Residual Volume.

When a person breathes out as forcefully as possible, the lungs still contain some air that cannot be expelled. This volume, which keeps the alveoli partly inflat …

Tidal volume (TV) — the air moved in a single ordinary breath at rest — is about 500 mL in a normal person.

Respiratory (lung) volumes are measured by spirometry and include:

• Tidal Volume (TV): volume inspired or expired during a normal, quiet breath — about 500 mL.
• Inspiratory Reserve Volume (IRV): additional air that can be forcibly inhaled after a normal inspiration — about 2500-3000 mL.
• Expiratory Reserve Volume (ERV): additional air that can be forcibly exhaled after a normal expiration — about 1000-1100 mL. …

Tidal volume, the air moved in one normal resting breath, is approximately 500 mL in a healthy human adult.

Respiratory (lung) volumes are measured to assess breathing capacity. Tidal Volume (TV) is the volume of air inspired or expired during one normal, unforced breath, and in a healthy adult at rest it is approximately 500 mL - a person breathes in and breathes out about …

Residual Volume - the air that always remains in the lungs and cannot be exhaled even by the most forceful effort - is approximately 1100-1200 mL, matching option (a).

Even after the deepest possible forced exhalation, the lungs cannot collapse completely and expel every last bit of air; some air always remains trapped in the alveoli and airways to keep them from collapsing. This trapped air is called the Residual Volume (RV) …

Residual Volume is the air that can never be voluntarily expelled from the lungs — it keeps the lungs from collapsing.

Lung capacities and volumes are described in relation to a normal breathing cycle. After a person breathes out as forcefully as possible (a maximal expiration, using the Expiratory Reserve Volume in addition to the Tidal Volume), a certain amount of air is still trapped in the lungs and cannot be expelled by voluntary effort. This is the Residual Volume (RV), approximately 1100–1200 mL in an adult human. Because it can never be exhaled, RV cannot be measured directly by a simple spi …

Tidal volume, the amount of air breathed in or out during a single normal (resting) breath, averages about 500 mL in a healthy adult human.

Human lung capacities and volumes are measured and defined precisely in respiratory physiology. Tidal Volume (TV) is the volume of air an individual inhales or exhales during normal, quiet, unforced breathing (i.e., a single resting breath), and its standard textbook value is approximately 500 mL (about 6000-8000 mL of air is moved per minute at a normal breathing rate of 12-16 breaths/minute). This is distinct from other lung volumes: Inspiratory Reserve Volume (the extra air that can be forcibly inhaled after a normal inspiration) is about 2500-3000 mL, Expiratory Reserve Volume (the extra air that can be forcibly exhaled after a normal expiration) is about 1000-1100 mL, and Residual Volume (air remaining in the lungs even after maximum f …

FRC = ERV + RV, roughly 2500 mL — the air still left in the lungs after breathing out normally.

Lung volumes and capacities describe the amount of air the lungs hold at different points of breathing. Functional Residual Capacity (FRC) is defined as the volume of air that remains in the lungs after a normal, quiet expiration (i.e., after breathing out a normal tidal volume). It is the sum of the Expiratory Reserve Volume (ERV — the extra air that can still be forcibly exhaled after a normal expiration, about 1000-1100 mL) and the Residual Volume (RV — the air that always rem …

Inspiratory reserve volume is the additional air one can breathe in forcefully after a normal inspiration.

Human lung capacities are measured using a spirometer and broken into standard volumes. Tidal volume (TV) is the air inhaled or exhaled during normal quiet breathing (about 500 mL). Beyond a normal inspiration, a person can still forcibly draw in extra air — this additional volume is the Inspiratory Reserve Volume (IRV), approximately 2500-3000 mL in a healthy adult. Similarly, after a normal expiration, extra air can still be forcibly exhaled — this is the Expiratory Reserve Volume (ERV), about 1000-1 …

Total Lung Capacity (TLC) is the maximum air the lungs can hold, calculated as Vital Capacity plus Residual Volume (TLC = VC + RV), since VC itself already equals IRV + TV + ERV.

Lung volumes are defined as:

• Tidal Volume (TV): air inhaled/exhaled in normal quiet breathing (~500 mL).
• Inspiratory Reserve Volume (IRV): extra air that can be forcibly inhaled after a normal inspiration.
• Expiratory Reserve Volume (ERV): extra air that can be forcibly exhaled after a normal expiration.
• Residual Volume (RV): air remaining in the lungs even after the most forceful exhalation (cannot be voluntarily expelled).

Vital Capacity (VC) = IRV + TV + ERV — the maximum air that can be voluntarily moved in and out. …