GENERAL HISTOLOGY

Detailed explanation-1: -The correct answer is A. (association areas). Association areas deal with higher mental functions such as thinking, planning etc.

Detailed explanation-2: -A team of researchers from the Massachusetts Institute of Technology (MIT) has found that, compared to other mammals, human brains have a much lower number of the neuronal channels that allow the flow of ions such as calcium, potassium, and sodium.

Detailed explanation-3: -Some leading arguments have been that our brains have more neurons and expend more energy than would be expected for our size, and that our cerebral cortex, which is responsible for higher cognition, is disproportionately large-accounting for over 80 percent of our total brain mass.

Detailed explanation-4: -Human brains vary considerably in size across adults, with males having slightly larger brains than females. It is hard to pin down what makes the human brain exceptional among mammals-neither brain size, relative brain size nor number of neurons is unique to humans.