It's physical, it's an integrated unit, and its parts all operate on a neuron-based system, so I wouldn't divide it beyond saying that the brain has different parts which it uses singly or in combinations for its various functions.
I see life as one's sense of self being generated by the brain, which perceives the world through the senses and sets out to make sense of it using the kit of instincts, abilities and functions our genetics give us.
You may have come across
>these experiments< back in 2008 which show that the nonconscious brain makes decisions and begins to act on them up to several seconds before the conscious brain is aware of the fact. They're only part of the reason why I think the conscious brain is much less important than has classically been asserted.
I don't understand infinity except as the concept that the number line can be extended without limit. The word also applies to (a) that slippery paradox in maths, infinitesmals and (b) a set of ideas from Cantor which have no counterpart in reality; I can work the maths but I can't pretend to have any intuitive comprehension of the concepts.