Urea transport in the dogfish kidney

Related Experiment Video

Updated: Jul 26, 2026

Analysis of Nephron Composition and Function in the Adult Zebrafish Kidney
08:53

Analysis of Nephron Composition and Function in the Adult Zebrafish Kidney

Published on: August 9, 2014

R M Hays, S D Levine, J D Myers

    The Journal of Experimental Zoology
    |March 1, 1977
    PubMed

    More Related Videos

    Functional Characterization of Na+/H+ Exchangers of Intracellular Compartments Using Proton-killing Selection to Express Them at the Plasma Membrane07:38

    Functional Characterization of Na+/H+ Exchangers of Intracellular Compartments Using Proton-killing Selection to Express Them at the Plasma Membrane

    Published on: March 30, 2015

    Evaluation of Zebrafish Kidney Function Using a Fluorescent Clearance Assay08:13

    Evaluation of Zebrafish Kidney Function Using a Fluorescent Clearance Assay

    Published on: February 20, 2015

    Related Concept Videos

    Filtration and Urine Formation01:32

    Filtration and Urine Formation

    The function of the kidneys is to filter, reabsorb, secrete, and excrete. Every day the kidneys filter nearly 180 liters of blood, initially removing water and solutes but ultimately returning nearly all filtrates into circulation with the help of osmoregulatory hormones. This process removes wastes and toxins but is also crucial to maintain water and electrolyte levels. Most of these functions are performed by the tiny but numerous nephrons contained within the kidneys.
    Urea Cycle01:23

    Urea Cycle

    The urea cycle describes how liver cells convert ammonia to urea. Ammonia is a toxic waste product of protein catabolism. Land animals must convert ammonia into the less toxic urea which can be safely eliminated by the kidneys through urine. Marine animals excrete ammonia directly, and the surrounding water dilutes the ammonia to safe levels.
    Comparative Excretory Systems02:24

    Comparative Excretory Systems

    Animals have evolved different strategies for excretion, the removal of waste from the body. Most waste must be dissolved in water to be excreted, so an animal’s excretory strategy directly affects its water balance.
    Drug Elimination by Renal Route: Tubular Secretion01:15

    Drug Elimination by Renal Route: Tubular Secretion

    Once the process of glomerular filtration is completed, blood carrying unfiltered drug molecules traverses through efferent arterioles and makes its way into the peritubular capillaries in the proximal tubule. A variety of carriers play a pivotal role in actively secreting drugs from these peritubular capillaries into the tubular fluid. The organic anion transporter transfers acidic drugs, against an electrochemical gradient, from the peritubular capillaries into the renal tubule cells and...
    Reabsorption and Secretion in the PCT01:28

    Reabsorption and Secretion in the PCT

    The Proximal Convoluted Tubule, or PCT, plays a pivotal role in the body's filtration system. They are primarily responsible for reabsorbing solutes and water from the filtered fluid produced by the glomeruli. Most of the filtered water, ions, and organic solutes such as glucose and amino acids are reabsorbed by the PCT.
    Transport mechanisms involving sodium ions (Na+) contribute significantly to solute reabsorption. These mechanisms include symport and antiport processes.
    A key example is the...
    Pore Transport and Ion-Pair Transport01:17

    Pore Transport and Ion-Pair Transport

    Pore transport and ion-pair formation are critical mechanisms for the absorption and distribution of drugs in the body.
    Pore transport, also known as convective transport, is a process where small molecules like urea, water, and sugars rapidly cross cell membranes as though there were channels or pores in the membrane. Although direct microscopic evidence is limited  but the concept of pores or channels is widely accepted based on physiological evidence. Despite the lack of direct microscopic...