Urinary System

Functions of Urinary System

Includes storage and excretion of urine, filtration of blood, release of erythropoietin, regulation of erythrocyte production, and regulation of ions and acid/base levels.

Clinical Progression of Kidney Disease

Kidneys lose ability to filter imbalances, leading to uremic toxin accumulation, inability to produce erythropoietin, resulting in anemia and potential heart failure.

Embryology of Urogenital System

Derives from intermediate mesoderm, forming urogenital ridge, pronephros, mesonephros, and metanephros, leading to the development of urinary bladder, urethra, and other associated structures.

Organs of Urinary System

Includes paired kidneys for waste filtration, ureters, urinary bladder, and urethra for urine transport

Nephron Function

Modifies blood filtrate through filtration, reabsorption, and secretion processes, involving the renal corpuscle, proximal and distal convoluted tubules, nephron loop, and collecting ducts.

Structure of Renal Corpuscle

Comprised of glomerulus, glomerular capsule, and two poles (vascular and tubular) with a filtration membrane allowing selective filtration due to high pressure.

Proximal Convoluted Tubule

Contains simple cuboidal epithelium with microvilli for reabsorption and secretion, actively modifying filtrate.

Nephron Loop

Consists of two limbs for water reabsorption, with cortical and juxtamedullary nephrons playing different roles in urine concentration.

Distal Convoluted Tubule

Features simple cuboidal epithelium with sparse microvilli for secretion and absorption, influencing water and ion balance.

Urinary Tract

Comprises ureters, urinary bladder, and urethra, with the ureter's structure involving mucosa, muscularis, and adventitia layers for unidirectional urine movement.