tidal volume

(noun)

the amount of air breathed in or out during normal respiration

Related Terms

Examples of tidal volume in the following topics:

  • Lung Volumes and Capacities

    • The volume in the lung can be divided into four units: tidal volume, expiratory reserve volume, inspiratory reserve volume, and residual volume.
    • It is the sum of the expiratory reserve volume, tidal volume, and inspiratory reserve volume.
    • It is, therefore, the sum of the tidal volume and inspiratory reserve volume.
    • It is the sum of the residual volume, expiratory reserve volume, tidal volume, and inspiratory reserve volume. .
    • Tidal volume is the volume of air inhaled in a single, normal breath.

  • The Work of Breathing

    • There are two ways to keep the alveolar ventilation constant: increase the respiratory rate while decreasing the tidal volume of air per breath (shallow breathing), or decrease the respiratory rate while increasing the tidal volume per breath.
    • Both tidal volume and respiratory rate are closely regulated when oxygen demand increases.
    • Those with obstructive diseases have large volumes of air trapped after exhalation.
    • They breathe at a very high lung volume to compensate for the lack of airway recruitment.

  • Mangroves

    • Mangrove swamps are found in tropical and subtropical tidal areas.
    • Likewise, they slow down tidal water enough so its sediment is deposited as the tide comes in, leaving all except fine particles when the tide ebbs.
    • Mangrove trees bordering a tidal estuary in Everglades National Park, Florida, USA

  • Estuaries & Marshes

    • A salt marsh or saltmarsh, also known as a coastal salt marsh or a tidal marsh, is a coastal ecosystem in the upper coastal intertidal zone between land and open salt water or brackish water that is regularly flooded by the tides.
    • Coastal salt marshes can be distinguished from terrestrial habitats by the daily tidal flow that occurs and continuously floods the area.
    • At higher elevations in the upper marsh zone, there is much less tidal inflow, resulting in lower salinity levels.
    • Soil salinity in the lower marsh zone is fairly constant due to everyday annual tidal flow.

  • Cell Size

    • Cell size is limited in accordance with the ratio of cell surface area to volume.
    • Consider the area and volume of a typical cell.
    • Therefore, as a cell increases in size, its surface area-to-volume ratio decreases.
    • Increased volume can lead to biological problems.
    • The cell on the left has a volume of 1 mm3 and a surface area of 6 mm2, with a surface area-to-volume ratio of 6 to 1, whereas the cell on the right has a volume of 8 mm3 and a surface area of 24 mm2, with a surface area-to-volume ratio of 3 to 1.

  • Limiting Effects of Diffusion on Size and Development

    • Recall that any three-dimensional object has a surface area and volume; the ratio of these two quantities is the surface-to-volume ratio.
    • The surface-to-volume ratio of a sphere is 3/r; as the cell gets bigger, its surface-to-volume ratio decreases, making diffusion less efficient .
    • The image illustrates the comparison of spheres of one to one thousand volume units.
    • The surface-to-volume ratio of a sphere decreases as the sphere gets bigger.
    • The surface area of a sphere is 4πr2 and it has a volume of (4/3)πr3 which makes the surface-to-volume ratio 3/r.

  • The Mechanics of Human Breathing

    • The relationship between gas pressure and volume helps to explain the mechanics of breathing.
    • Boyle's Law is the gas law which states that in a closed space, pressure and volume are inversely related.
    • As volume decreases, pressure increases and vice versa .
    • Due to this increase in volume, the pressure is decreased, based on the principles of Boyle's Law.
    • This graph of data from Boyle's original 1662 experiment shows that pressure and volume are inversely related.

  • Phylum Porifera

    • The great majority of the marine species can be found in ocean habitats ranging from tidal zones to depths exceeding 8,800 m (5.5 mi).

  • Characteristics of Prokaryotic Cells

    • First, we'll consider the area and volume of a typical cell.
    • You may remember from your high school geometry course that the formula for the surface area of a sphere is 4πr2, while the formula for its volume is 4/3πr3.
    • Therefore, as a cell increases in size, its surface area-to-volume ratio decreases.
    • If the cell grows too large, the plasma membrane will not have sufficient surface area to support the rate of diffusion required for the increased volume.
    • Notice that as a cell increases in size, its surface area-to-volume ratio decreases.When there is insufficient surface area to support a cell's increasing volume, a cell will either divide or die.The cell on the left has a volume of 1 mm3 and a surface area of 6 mm2, with a surface area-to-volume ratio of 6 to 1, whereas the cell on the right has a volume of 8 mm3 and a surface area of 24 mm2, with a surface area-to-volume ratio of 3 to 1.

  • Blood Pressure

    • The body regulates blood pressure by changes in response to the cardiac output and stroke volume.
    • Cardiac output is the volume of blood pumped by the heart in one minute.
    • It is calculated by multiplying the number of heart contractions that occur per minute (heart rate) times the stroke volume (the volume of blood pumped into the aorta per contraction of the left ventricle).
    • However, cardiac output can also be increased by increasing stroke volume, such as if the heart were to contract with greater strength.
    • Stroke volume can also be increased by speeding blood circulation through the body so that more blood enters the heart between contractions.