Facts about the human brain
The average weight of the human brain at birth is 350-400 grams and grows four times its original size until it reaches about one and a half kilograms at puberty.
The human brain is made up of approximately 75% water, plus fat and protein.
The average adult brain contains about eighty-six billion neurons, or neurons, that carry information and transmit it between sensory organs and muscles in the body.
The human brain is made up of billions of glial cells, which help nerve cells stick together, clean up excess neurotransmitters, and support synaptic growth.
The brain requires about 20% of the body’s oxygen and 25% of the body’s glucose, although it accounts for 2% of the total body weight.
Strong brain injuries are major causes of disability and death, especially those from falls, car accidents, and assaults.
The human brain becomes smaller as it ages, and usually occurs after middle age.
Facts about the human heart
The average size of the heart is approximately the size of a fist in adults, and beats about 115,000 times a day, pumping about 7,570 liters of blood per day, and the first open-heart surgery was performed in 1893 by Daniel Hill Williams.
A woman’s heart beats a little faster than a man’s.
The sound of the heartbeat is caused by the opening and closing of the valves.
Heart cells stop dividing, making heart cancer very rare.
Laughter is good for the heart; it reduces stress and boosts the immune system.
General facts about the human body
The mouth produces about a liter of saliva a day.
The brain is sometimes more active at bedtime.
The body has blood vessels, which can rotate four times around the Earth’s equator in adults.
The human body loses about four kilograms of skin cells each year.
Children cannot shed tears until they reach at least one month.
The left lung in humans is about 10% smaller than the right lung.
A human nose can recognize a trillion different scents, according to scientists.
Blood makes up about 8% of body weight.
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