### **Human Urinary System – Key Features**
The urinary system consists of specialized organs that work together to filter blood, remove waste, and maintain fluid and electrolyte balance.
**Kidneys**
– Paired, bean-shaped organs that filter blood to eliminate waste (e.g., urea, excess salts).
– Regulate blood pressure, electrolyte levels, and red blood cell production.
**Ureters**
– Two narrow tubes that transport urine from the kidneys to the bladder.
**Bladder**
– A muscular, expandable sac that stores urine (capacity: ~600 mL).
– Contracts during urination to expel urine.
**Arteries & Veins**
– Represented in red (arteries) and blue (veins) on models.
– Supply blood to the kidneys for filtration and oxygenate urinary tissues.
**Urethra**
– The final passageway for urine excretion from the bladder to the exterior.
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