It serves as energy for the body the cells it helps carry out nerve ceel conduction muscle cell contraction, active transport and the production of chemical substances.
as you see you got this problem wrong becuase Its c :)
btw i got same question are we on same schools lol
the answer is Life Science
Atria is a large part of the heart so too big for cells; arteries & veins lead away or to the heart.
Capillaries are the smallest vascular structures that allow materials to be exchanged easily between cells.
