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Human Anatomy Challenge
Anatomy is the map everything else in medicine is drawn on — and a few of its landmarks are worth knowing cold. This short challenge covers five of them: the body's largest organ, how many bones an adult really has (and why babies have more), which heart chamber does the heaviest work, the longest bone in the body, and the organ that makes insulin. Quick to take, and every answer comes with the reasoning, so you keep the knowledge rather than just the score.
✓ Medically reviewed by Dr. Mohamed Ibrahim, MD, PhD — physician-scientist · Last reviewed: October 2026
How it works: five questions, one best answer each. Tap an answer and you will see straight away whether it is right, with a short explanation of the reasoning. Your score builds as you go — there is no timer and no account needed.
Question 1 of 5
What is the largest organ of the human body?
The skin is the body's largest organ, covering roughly two square metres in an average adult and acting as barrier, sensor and temperature regulator all at once. The liver holds the title of largest internal organ.
Question 2 of 5
How many bones does a typical adult human skeleton have?
Adults have 206 bones. Babies are born with around 300 separate bony elements, many of which fuse together as they grow — which is why children's skeletons are not simply small adult skeletons.
Question 3 of 5
Which chamber of the heart pumps oxygen-rich blood out to the whole body?
The left ventricle has the thickest muscular wall of the four chambers because it pumps blood around the entire body through the aorta. The right ventricle, by comparison, only has to reach the lungs next door.
Question 4 of 5
The femur is…
The femur runs from hip to knee and is the longest, heaviest and strongest bone in the body, built to carry the body's full weight in walking, running and jumping.
Question 5 of 5
Insulin is produced by which organ?
Insulin is made by clusters of hormone-producing cells called the islets of Langerhans, scattered through the pancreas. Insulin is the signal that lets the body's cells take up and use glucose from the blood.
Your result
Keep learning
Browse by TopicExplore the whole video library by condition, specialty and body system.Open → Knee Replacement — Condition HubThe anatomy of the knee joint, why it wears out, and the surgery that replaces it.Open → For Nurses — Skills & ProceduresAnatomy in practice: the nursing skills section, with Key Steps cards and videos.Open →Frequently asked questions
Why do babies have more bones than adults?
A baby's skeleton contains around 300 bony elements, many of them partly cartilage. As a child grows, separate pieces fuse into single bones — in the skull, the spine and the long bones, for example — bringing the adult total down to 206. The flexible, unfused skeleton is also what allows a baby to pass through the birth canal and grow rapidly.
What is the smallest bone in the body?
The stapes, one of the three tiny ossicles in the middle ear, is the smallest bone — only a few millimetres long. Together with the malleus and incus it passes sound vibrations from the eardrum to the inner ear.
These quizzes are for learning only. They are not medical advice, cannot diagnose anything, and do not replace assessment by a qualified clinician. If you have symptoms now — especially chest pain, severe abdominal pain, or sudden weakness or speech problems — seek urgent medical care.