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Renal Anatomy and Physiology

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  • Anatomy of a nephron

    A nephron consists of the renal corpuscle (glomerulus and Bowman's capsule) and the renal tubule (proximal tubule, loop of Henle, distal tubule, and collecting duct).

  • Three major renal processes

    Filtration-Blood pressure substances from glomerular capillaries into Bowman’s capsule/reabsorption-Essential substances reclaimed from renal tubule moved into peritubular capillaries/secretion Additional waste products moved from blood to renal tubules /are the key processes in urine formation.

  • Forces promoting glomerular filtration

    Glomerular hydrostatic pressure promotes filtration by pushing fluid out of capillaries.

  • Forces opposing glomerular filtration

    Capsular hydrostatic pressure and blood colloid osmotic pressure oppose filtration by pushing fluid back into capillaries.

  • Intrinsic control of glomerular filtration rate (GFR)

    Includes myogenic mechanism and tubuloglomerular feedback to maintain stable GFR despite blood pressure changes.

  • Extrinsic control of GFR

    Involves sympathetic nervous system and renin-angiotensin system to regulate GFR during stress or low blood volume.

  • Mechanisms of water and solute reabsorption

    Reabsorption occurs via active transport, osmosis, and diffusion from renal tubules into peritubular capillaries.

  • Regulation of sodium and water reabsorption in distal tubule and collecting duct

    Controlled by hormones like aldosterone (sodium) and antidiuretic hormone (ADH) (water).

  • Importance of tubular secretion

    Tubular secretion removes substances like H+, potassium, and drugs from blood into tubules for excretion.

  • Formation of dilute urine

    Occurs when ADH is low, allowing water to remain in tubules and be excreted, producing dilute urine.

  • Formation of concentrated urine

    Occurs when ADH is high, increasing water reabsorption and concentrating urine.

  • Normal physical properties of urine

    Urine is typically clear, pale yellow, with a specific gravity of about 1.003 to 1.030.

  • Normal chemical properties of urine

    Contains mostly water, urea, creatinine, and electrolytes.

  • Abnormal urine components and associated conditions

    Glucose (diabetes mellitus), protein (kidney damage), ketones (starvation or diabetes), and blood (infection or trauma).

  • General location of ureters, bladder, and urethra

    Ureters connect kidneys to bladder; bladder stores urine; urethra conducts urine out of the body.

  • Structure of ureters

    Muscular tubes with smooth muscle layers that propel urine by peristalsis from kidneys to bladder.

  • Structure of urinary bladder

    Hollow, muscular organ with a transitional epithelium lining and detrusor muscle for urine storage and expulsion.

  • Structure of urethra

    Tube lined with mucosa and smooth muscle that carries urine from bladder to exterior.

  • Definition of micturition

    Micturition is the process of urine voiding from the bladder.

  • Neural control of micturition

    Involves parasympathetic stimulation to contract bladder and somatic control of external sphincter for voluntary urination.