Human Brain Facts
The typical brain is about 2% of a body’s weight but uses 20% of its total energy and oxygen intake.
The average adult human brain weighs about 3 pounds (1,361 grams).
25% of the body’s cholesterol resides within the brain. Cholesterol is an integral part of every brain cell. Without adequate cholesterol, brain cells die
Only 5 minutes without oxygen can cause brain damage
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Women are twice as likely to be diagnosed with depression than men in the United States.
Albert Einstein’s brain weighed in at 2.71 pounds — 10% smaller than the average of 3 pounds.
The human brain has about 100,000,000,000 (100 billion) neurons.
It’s often said there are 10,0000 miles of blood vessels in the brain when it fact that number is closer to 400 miles
Humans don’t have the biggest brains. That honor belongs to sperm whales with 17 pound brains
In general, men’s brains are 10% bigger than women’s, even after taking into account larger body size
More than 100,000 chemicals reactions take place in your brain every second
Our brains are getting smaller. Over the past 10-20,000 years, the size of the average human brain has shrunk by the size of a tennis ball.
From all the oxygen that a human breathes, twenty percent goes to the brain.
As any parent can attest, teen brains are not fully formed until about the age of 25
People who ride on roller coasters have a higher chance of having a blood clot in the brain.
Babies have big heads to hold rapidly growing brains. A 2-year-old’s brain is 80% of adult size.
Once a human reaches the age of 35, he/she will start losing approximately 7,000 brain cells a day. The cells will never be replaced.
Ninety minutes of sweating can temporarily shrink the brain as much as one year of aging
It is not possible to tickle yourself. The cerebellum, a part of the brain, warns the rest of the brain that you are about to tickle yourself. Since your brain knows this, it ignores the resulting sensation.
A women from Berlin Germany has had 3,110 gallstones taken out of her gall bladder.
Oldest brain. A brain thought to be 2000 years old was unearthed just recently at the University of York in northern England.
The brain of an adult human weighs around 3 pounds (1.5 kg). Although it makes up just 2% of the body’s weight, it uses around 20% of its energy.
The human brain is over three times as big as the brain of other mammals that are of similar body size.
The human brain is protected by the skull (cranium), a protective casing made up of 22 bones that are joined together.
In America, the most common mental illness is Anxiety Disorders.
Your brain is 80% water.
Your brain is move active and thinks more at night than during the day.
The relationship between brain size and intelligence isn’t really about the actual weight of the brain; it’s about the ratio of brain weight to the entire body weight. For humans, that ratio is about 1-to-50. For most other mammals, it’s 1-to-180, and for birds, it’s 1-to-220.
Moments in History
2000 B.C.. Archeologists found evidence that primitive brain surgery was performed by drilling a hole in the skull.
1811. Scottish surgeon Charles Bell described how each of the senses had a corresponding spot in the brain.
1899. Aspirin was marketed as a pain reliever, but was not available without a prescription until 1915.
1921. Hermann Rorschach invented the now-famous ink blot test for use with his patients.
1959. The first rhesus monkey was sent into space to study human behavior.
The physical make-up of the human brain.(Important Points)
Weight. The weight of the human brain is about 3 lbs.
Cerebrum. The cerebrum is the largest part of the brain and makes up 85% of the brain’s weight.
Skin. Your skin weighs twice as much as your brain.
White matter. The white matter is made up of dendrites and axons, which create the network by which neurons send their signals.
Gray matter. The brain’s gray matter is made up of neurons, which gather and transmit signals.
Gray and white. Your brain is 60% white matter and 40% gray matter.
No pain. There are no pain receptors in the brain, so the brain can feel no pain.
Neurons. Your brain consists of about 100 billion neurons.
Synapses. There are anywhere from 1,000 to 10,000 synapses for each neuron.
Largest brain. While an elephant’s brain is physically larger than a human brain, the human brain is 2% of total body weight (compared to 0.15% of an elephant’s brain), meaning humans have the largest brain to body size.
Blood vessels. There are 100,000 miles of blood vessels in the brain.
Fat. The human brain is the fattest organ in the body and may consists of at least 60% fat.