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Free Human Body quiz: 106 trivia questions and answers β organs, bones & the brain. Easy to hard, with explained answers. No sign-up.
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From the tiny bones of the ear to eye colour, this quiz explores human anatomy and how the body works. A fun way to better understand the machine that keeps you alive.
This quiz currently has 106 questions, ranging from easy to hard, available in French, English and Spanish when the Spanish translation is available.
Warm up before the quiz with these 20 trivia questions and their explained answers: click a question to reveal the answer.
Answer: 5. In the body of a 65 kg man, 5 to 6 liters of blood circulate; 4 to 5 liters in a woman (increasing to 5-6 liters during pregnancy); about 3 liters in a child, and 250 milliliters in a newborn.
Answer: 206. The human skeleton consists of about 206 fixed bones in adulthood (around 270 at birth), plus a variable number of extra bones depending on the individual. These bones are supported and reinforced by ligaments.
Answer: The masseter. The masseter, a jaw muscle, is the strongest relative to its size. It can exert a bite force exceeding 500 newtons.
Answer: Cones. Cones, concentrated in the fovea of the retina, are the photoreceptors responsible for color vision. There are three types, sensitive to red, green, and blue respectively. Rods, on the other hand, detect brightness in low light.
Answer: Dopamine. Dopamine is essential to the reward system and motivation.
Answer: Pancreas. The exocrine pancreas secretes digestive enzymes (lipase, amylase, proteases).
Answer: 46. A human cell has 46 chromosomes, arranged in 23 pairs: 22 pairs of autosomes and one pair of sex chromosomes.
Answer: Three. The skin is made up of three main layers: the epidermis on the surface, the dermis, and the hypodermis underneath.
Answer: The Achilles tendon. The Achilles tendon, which connects the calf to the heel, is the thickest and strongest tendon in the human body, able to withstand considerable tension.
Answer: About 14. At rest, an adult takes on average between 12 and 16 breaths per minute, or about 20,000 per day.
Answer: vagus. The vagus nerve is the longest cranial nerve: it runs from the brainstem down to the viscera, supplying the heart, stomach and intestines. The sciatic nerve, which is not a cranial nerve, is the longest and thickest nerve in the body.
Answer: 120 m/s. Large myelinated nerve fibers (type AΞ±) conduct impulses at 70-120 m/s, or about 432 km/h.
Answer: 1 L. The salivary glands produce between 0.5 and 1.5 liters of saliva per day, on average 1 liter. Saliva starts digestion and protects the teeth.
Answer: 100,000 km. If you unwound all the blood vessels (arteries, veins, capillaries) in a human body, they would stretch about 100,000 km β that's two and a half times around the Earth.
Answer: Directly attack infected cells. T lymphocytes are immune cells that destroy cells infected by viruses or tumors.
Answer: 4. The brain contains 4 ventricles filled with cerebrospinal fluid.
Answer: Bone and tissue growth. GH stimulates cell multiplication and the growth of bones and tissues.
Answer: About 10,000. An adult has on average nearly 10,000 taste buds. Their number gradually decreases with age, which partly explains why sensitivity to flavors declines in older people.
Answer: The semicircular canals. The semicircular canals of the inner ear detect rotational movements of the head and play an essential role in balance.
Answer: The adrenal glands. The adrenal glands, located above the kidneys, produce adrenaline, a hormone released in response to stress or danger.
86 more questions are waiting for you in the quiz!