Laid end to end, an adult’s blood vessels could circle Earth’s equator four times! 
Your mouth produces about one litre of saliva each day! 
Humans have a stage of sleep that features rapid eye movement (REM). REM sleep makes up around 25% of total sleep time and is often when you have your most vivid dreams. 
The brain uses over a quarter of the oxygen used by the human body.
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Infants blink only once or twice a minute while adults average around 10. 
The smallest bone found in the human body is located in the middle ear. The staples (or stirrup) bone is only 2.8 millimetres long.
Important stage of human reproduction….
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Pituitary Gland
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Human Brain 🧠
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Human Nervous System
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#2 - COMPONENTS OF BLOOD PLASMA 🩸| Biology Classes
Human Circulatory System
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