---
id:"kb-2026-00341"
title:"Human Anatomy"
schema_type:"TechArticle"
category:"science"
language:"en"
confidence:"high"
last_verified:"2026-05-22"
generation_method:"ai_assisted"
ai_models:["claude-opus"]
derived_from_human_seed:true
primary_sources:
  - title:"Gray's Anatomy (41st Edition)"
    type:"book"
    year:2015
    url:"https://www.elsevier.com/books/grays-anatomy/standring/978-0-7020-5230-9"
    institution:"Elsevier"
secondary_sources:
  - title: "MDN Web Docs — HTTP"
    type: "documentation"
    year: 2026
    url: "https://developer.mozilla.org/en-US/docs/Web/HTTP"
    institution: "Mozilla"
completeness: 0.88
ai_citations:
  last_citation_check:"2026-05-22"
---

## TL;DR

Human anatomy is the study of body structure. Systems: skeletal (206 bones, support), muscular (600+ muscles, movement), nervous (brain, spinal cord, nerves), cardiovascular (heart, blood vessels), respiratory (lungs, gas exchange), digestive, endocrine (hormones), immune, urinary, reproductive.

## Core Explanation

Brain: ~86 billion neurons, consumes 20% of body's energy. Heart: pumps 7,000 liters of blood daily, beats ~100,000 times. Lungs: 300 million alveoli for gas exchange, surface area ~75 m². Bones: strongest is femur (can support 30x body weight), smallest is stapes (ear, 3mm). DNA in each cell: ~2 meters if stretched — body contains ~70 round trips to the sun of DNA. Liver: only organ that can regenerate.

## Further Reading

- [Gray's Anatomy (41st Edition)](https://www.elsevier.com/books/grays-anatomy/standring/978-0-7020-5230-9)