12/24/2025
SYSTEMS OF THE HUMAN BODY
Sourav Yoga
The Systems That Keep Us Alive
Vascular system: ~100,000 km of blood vessels
Oxygen transport
Nutrient delivery
Hormone circulation
Cellular energy supply
Nervous system: ~150,000 km of nerve fibers
Signal transmission Homeostatic regulation Stress response Protective reflexes
Lymphatic system: ~600 lymph nodes
Waste elimination Toxin clearance Immune surveillance Fluid balance
Skeletal system: 206 bones in adults
Structural support
Mobility facilitation Mineral homeostasis Hematopoiesis (blood cell production)
Meridian system: 12 principal + 8 extraordinary