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Everyday Learning
Free Human Body Facts Flashcards
A general-knowledge tour of your own machinery — the numbers and mechanisms that come up in quizzes, conversations, and health literacy. Satisfying to know cold.
Study these 10 starter cards
QUESTION
Tap the card to reveal the answer
QHow many times does the heart beat per day (roughly)?
AAbout 100,000 times
QWhat is the body’s fastest-healing organ region?
AThe mouth/oral mucosa heals notably fast
QHow long is the small intestine (roughly)?
AAbout 6 meters (20 feet)
QWhich organ uses about 20% of the body’s energy?
AThe brain
QHow many liters of blood does an adult have?
AAbout 5 liters
QWhat is the smallest bone in the body?
AThe stapes, in the middle ear
QHow often is your skin’s outer layer replaced?
ARoughly every 2–4 weeks
QWhat percentage of the body is water (roughly)?
AAbout 60%
QHow many muscles does the human body have (roughly)?
AAround 600
QWhich sense is most directly wired to memory centers?
ASmell — the olfactory bulb connects closely to the hippocampus and amygdala
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Reading answers is recognition — remembering them next month takes spaced repetition. Build your own human body facts deck and we'll schedule every review at the right moment.
Create your free deck →How to study human body facts with flashcards
- One fact per card. These make a perfect starter deck for trying spaced repetition itself — familiar enough to be fun, surprising enough to need review.
- Rate honestly. After each card, choose Again, Hard, Good, or Easy — the spaced repetition algorithm uses your answer to decide when the card returns, right before you'd forget it.
- A few minutes daily beats marathons. Ten new cards a day is roughly 3,650 a year, retained. Deep dives: How to stay consistent with studying · Why you forget what you study.
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