all the above
Your metabolism effects the burning of calories that are necessary to supply your body with energy.
Burning calories digesting food and circulating blood
all the above apex
The main function of Metabolism is to synthesise, use and store energy.
Unless you're standing or walking in circles while doing it. Laying and sitting is a state of bodily relaxation which slows down metabolism. This is a function of the parasympathetic nervous system.
It lowers the metabolism.
The metabolism can affect the nervous and endocrine system.