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  2. Kidney - Wikipedia

    en.wikipedia.org/wiki/Kidney

    The human kidney is a bean-shaped structure with a convex and a concave border. [14] A recessed area on the concave border is the renal hilum , where the renal artery enters the kidney and the renal vein and ureter leave.

  3. Urinary system - Wikipedia

    en.wikipedia.org/wiki/Urinary_system

    In a healthy human, the kidney receives between 12 and 30% of cardiac output, but it averages about 20% or about 1.25 L/min. The basic structural and functional unit of the kidney is the nephron . Its chief function is to regulate the concentration of water and soluble substances like sodium by filtering the blood , reabsorbing what is needed ...

  4. Mammalian kidney - Wikipedia

    en.wikipedia.org/wiki/Mammalian_kidney

    It is assumed that unipapillary kidney was the original kidney structure in mammals, from which multilobar kidneys evolved. [ 19 ] More complex multilobar kidneys likely emerged as an adaptation to the increased body mass of mammals and the corresponding need for an increase in the number of nephrons in the kidneys. [ 20 ]

  5. Renal physiology - Wikipedia

    en.wikipedia.org/wiki/Renal_physiology

    Renal physiology (Latin renes, "kidneys") is the study of the physiology of the kidney. This encompasses all functions of the kidney, including maintenance of acid-base balance; regulation of fluid balance; regulation of sodium, potassium, and other electrolytes; clearance of toxins; absorption of glucose, amino acids, and other small molecules ...

  6. Collecting duct system - Wikipedia

    en.wikipedia.org/wiki/Collecting_duct_system

    The collecting duct system is the final component of the kidney to influence the body's electrolyte and fluid balance. In humans, the system accounts for 4–5% of the kidney's reabsorption of sodium and 5% of the kidney's reabsorption of water. At times of extreme dehydration, over 24% of the filtered water may be reabsorbed in the collecting ...

  7. Renal medulla - Wikipedia

    en.wikipedia.org/wiki/Renal_medulla

    The renal medulla (Latin: medulla renis 'marrow of the kidney') is the innermost part of the kidney. The renal medulla is split up into a number of sections, known as the renal pyramids. Blood enters into the kidney via the renal artery, which then splits up to form the segmental arteries which then branch to form interlobar arteries.

  8. Kidney (vertebrates) - Wikipedia

    en.wikipedia.org/wiki/Kidney_(vertebrates)

    All vertebrates have kidneys. The kidneys are the main organ that allows species to adapt to different environments, including fresh and salt water, terrestrial life and desert climate. [7] Depending on the environment in which animals have evolved, the functions and structure of the kidneys may differ. [8]

  9. Renal pelvis - Wikipedia

    en.wikipedia.org/wiki/Renal_pelvis

    Like the bony pelvis, the renal pelvis (/ ˈ r iː n əl ˈ p ɛ l v ɪ s /) gets its English name via Neo-Latin from the older Latin word pelvis, "basin", as in "wash basin". [4] In both cases the name reflects the shape of the structure, and in the case of the renal pelvis, it also reflects the function.