How many neurons are in the human brain?
The human brain contains about 86 billion neurons.
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- What muscle helps us breathe?
“The lungs have no muscles of their own. The diaphragm does most of the work of breathing.”
Reference: Cleveland Clinic
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Why is the left lung smaller?
The left lung is smaller than the right to make room for the heart.
How much energy does the brain use?
The brain makes up only about 2% of body weight but uses about 20% of the body's energy.