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Hepatic clearance refers to the volume of blood cleared of a drug by the liver per unit of time. It plays a crucial role in drug metabolism and elimination. While hepatic clearance is commonly estimated by subtracting renal clearance from total body clearance, other pathways, such as pulmonary or biliary clearance, may also contribute. However, these pathways are generally less significant than hepatic and renal clearance.
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The glomerular filtration rate (GFR) is a critical marker of kidney function, reflecting the efficiency of filtration by the glomeruli. Renal clearance of specific substances, such as inulin or creatinine, is commonly used to measure GFR.
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Related Experiment Video

Updated: Feb 15, 2026

Transdermal Measurement of Glomerular Filtration Rate in Mechanically Ventilated Piglets
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ON FEEDING MECHANISMS AND CLEARANCE RATES OF MOLLUSCAN VELIGERS.

R R Strathmann, E Leise

    The Biological Bulletin
    |January 12, 2018
    PubMed
    Summary

    Larger oyster veligers with longer cilia clear more particles faster but less efficiently. Egg size influences veliger feeding capacity, impacting larval development and survival in marine bivalves.

    Area of Science:

    • Marine biology
    • Larval ecology
    • Invertebrate zoology

    Background:

    • Cilia-driven feeding is crucial for marine invertebrate larvae.
    • Understanding particle capture mechanisms informs ecological models.

    Purpose of the Study:

    • To investigate the relationship between preoral cilia length and particle clearance rates in bivalve veligers.
    • To determine factors influencing particle capture efficiency and feeding rates.

    Main Methods:

    • Filming ciliary beat patterns and particle paths in veligers of Crassostrea gigas and other species.
    • Estimating clearance rates using a mathematical model based on cilia and particle velocities.
    • Analyzing particle capture events in relation to cilia proximity and movement.

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    Main Results:

    • Longer preoral cilia correlate with higher clearance rates but lower efficiency.
    • Veligers from larger eggs exhibit increased clearance rates due to longer cilia and velar edges.
    • Preoral cilia move 1.5 times faster than particles during effective strokes, with capture influenced by proximity to cilia base.

    Conclusions:

    • Egg size is a significant predictor of larval feeding capacity.
    • Cilia length and speed are key determinants of particle clearance and capture efficiency in veligers.
    • The proposed mechanism involves particle concentration, adhesion, and transport by cilia.