Urinary
The urinary system includes the bilateral kidneys, ureters, urinary bladder, and urethra filtering blood plasma, regulating fluid volume and electrolytes, and excreting nitrogenous metabolic wastes.
Quantitative Metrics & Physiological Scale
Glomeruli and renal tubule complexes across both kidneys
Total volume filtered across filtration membranes daily
Hyper-concentrated final excretion after 99% tubular reabsorption
Renopelvic junction, pelvic brim crossing, and intramural bladder wall
Physiological Role & Homeostasis
Plasma ultrafiltration and targeted clearance of urea, creatinine, and uric acid
Renin secretion and juxtaglomerular control of systemic arterial blood pressure
Erythropoietin (EPO) synthesis stimulating bone marrow erythrocyte production
Renal Cortex vs Renal Medulla
| Feature / 比较维度 | Renal Cortex / 肾皮质 | Renal Medulla / 肾髓质 |
|---|---|---|
| Location & Color / 解剖位置与色泽 | Superficial outer rim & renal columns / 位于肾实质表浅区并伸入锥体间形成肾柱，红褐色 | Deep interior pyramids (8-18 cone structures) / 位于深部，由 8-18 个纵纹状圆锥形肾锥体构成 |
| Nephron Constituents / 包含主要微观结构 | Renal corpuscles, proximal & distal convoluted tubules / 肾小体（血管球/肾小囊）及近曲小管与远曲小管 | Loops of Henle & straight collecting ducts / 髓袢降支与升支、集合管及深入肾乳头的乳头管 |
| Osmotic Function / 渗透浓度梯度功能 | Isosmotic primary filtration & bulk ion absorption / 与血浆呈等渗状态；负责初级大容量超滤与大量主动重吸收 | Creates hyperosmotic corticomedullary gradient / 形成渐进性高渗髓质逆流倍增体系，专职终尿浓缩 |
Vital Organs & Structures
How to Study This System in 3D
Cut a coronal cross section of the kidney in 3D to observe renal sinus cavities, major calyces, and the renal pelvis.
Inspect the right-angle take-off of bilateral renal arteries branching directly off the high-pressure abdominal aorta.
Explore Synergistic Anatomical Systems
For educational use only; not medical advice, diagnosis, or treatment.