Human anatomy is fascinatingly and frustratingly complex. In each body, 600 muscles, 206 bones, and 360 joints provide structural stability and movement; two lungs circulate air through 1,500 miles of airways to 480,000,000 alveoli with every breath.
One heart circulates five to six liters of blood through 60,000 miles of vessels every 30 seconds; 600 lymph nodes activate the immune system and filt…