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 5–6 liters of blood through 60,000 miles of vessels every 30 seconds; 600 lymph nodes activate the immune system and filter foreign invaders (e.g., bacteria, viruses), cellular de…
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