1. Human lungs contain almost 1,500 miles of airways and over 300 million alveoli.
2. An average person breathes in around 11,000 litres of air every day.
3. Around 80 per cent of what we think is taste is actually smell. Flavour, is a combination of taste and smell perception.
4. The brain uses over a quarter of the oxygen used by the human body.
5. The brain of an adult human weighs around 3 pounds (1.5 kg). Although it makes up just 2 per cent of the body’s weight, it uses around 20 per cent of its energy.
6. If you smoothed out all of the wrinkles in your brain, it would lay flat the size of a pillowcase.
7. Your heart beats around 100,000 times a day, 365,00,000 times a year and over a billion times if you live beyond 30.
8. Grouping human blood types can be a difficult process and there are currently around 30 recognised blood types (or blood groups). You might be familiar with the more simplified “ABO” system which categorises blood types under O, A, B and AB.
9. When listening to music, your heartbeat will sync with the rhythm.
10. An healthy adult human heart beats about 75 times on average in a minute.
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