Labels:food | plant | rock | sky | subarachnoid space OCR: The Physical Brain The brain. is often called the O most complex known object in the universe It weighs. 3-4lb (1.5-2kg) and is composed of about 1012 cells A tenth of the cells are neurons the nerve cells which pass signals the brain There are about as many neurons in the brain as there are stars in our galaxy wiich The surface of the brain is bhatit tma ri's more developed n humans than in Iany other andis largely responsible for our intelligence. The It is called the cortex' or the roof of the brain. It is a highly crumpled layer of Althoug any about 0.08 in (2 mm) thick. If pressed out flat it Would cover about 10 cells square feet(1 square metre). the size of an office desk top mm) thick, Although com prising only two -and-a-half percent of the body' weight, the brain the size of dema ...
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