tidal volume

volume /vol·ume/ (vol´ūm) the measure of the quantity or capacity of a substance. Symbol V or V.

---

end-diastolic volume  (EDV) the volume of blood in each ventricle at the end of diastole, usually about 120–130 mL but sometimes reaching 200–250 mL in the normal heart.

end-systolic volume  (ESV) the volume of blood remaining in each ventricle at the end of systole, usually about 50–60 mL but sometimes as little as10–30 mL in the normal heart.

expiratory reserve volume  the maximal amount of gas that can be exhaled from the resting end-expiratory level. Abbreviated ERV.

forced expiratory volume  the fraction of the forced vital capacity that is exhaled in a specific number of seconds. Abbreviated FEV with a subscript indicating how many seconds the measurement lasted.

inspiratory reserve volume  the maximal amount of gas that can be inhaled from the end-inspiratory position.

mean corpuscular volume  the average volume of erythrocytes, conventionally expressed in cubic micrometers or femtoliters per red cell.

minute volume  (MV) the quantity of gas exhaled from the lungs per minute; tidal volume multiplied by respiratory rate.

packed-cell volume  (PCV), volume of packed red cells (VPRC) hematocrit.

residual volume  the amount of gas remaining in the lung at the end of a maximal exhalation.

stroke volume  the volume of blood ejected from a ventricle at each beat of the heart, equal to the difference between the end-diastolic volume and the end-systolic volume.

tidal volume  the volume of gas inhaled and exhaled during one respiratory cycle.

---

tidal volume

n.

The volume of air inspired or expired in a single breath during regular breathing. Also called tidal air.

---

tidal volume (TV, V_t)

Etymology: AS, tid, time; L, volumen, paper roll

the amount of air inhaled and exhaled during normal ventilation. Inspiratory reserve volume, expiratory reserve volume, and tidal volume make up vital capacity. See also pulmonary function test.

---

tidal volume,

n the amount of air inhaled and exhaled during normal ventilation.

---

tidal volume

the amount of gas passing into and out of the lungs in each respiratory cycle.

---

tidal volume

Lung physiology The volume of air drawn into the lungs during inspiration from the end-expiratory position, which leaves the lungs passively during expiration in the course of quiet breathing. See Lung volumes. Cf Residual volume.