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Skin cells live about two or three weeks. Colon cells have it rough: They die off after about four days. Sperm cells have a life span of only about three days, while brain cells typically last an entire lifetime (neurons in the cerebral cortex, for example, are not replaced when they die). There's nothing special or significant about a seven-year cycle, since cells are dying and being replaced all the time.
The left hemisphere has 186 million more neurons than the right hemisphere How much blood flows through the brain per minute? 750-1000mL or 3 full soda cans How long can the brain survive without oxygenated blood? 4-6 minutes before the cells begin to die. After 10 seconds you loose consciousness How much of your body heat is lost through your head? 40-50% What is the longest living cell in your body? Your brain cells can live up to an entire lifetime How many brain cells (neurons) does the average human have? 100 billion What is the name of the chemical signal used between neurons? Neurotransmitters How long can a neuron be? Around 15 feet, in a Giraffe, from toe to neck How many brain imaging techniques can you name?