The exchange between the blood in the capillaries and the cells in the body is referred to as

this is the exchange of gases and nutrients.

It took me a bit but i figured it out!

Hope this helps you some!:)))

out of the choices i'd say d the ability to set goals, mainly because to desire to continue you need motivation but it isn't motivation in that part, but setting goals means you have an endgame and you want to reach it which sums up motivation.