Charles is an engineer who is evaluating a prototype of an artificial heart. He should notice the prototype missing is : a structure that would divide the hollow heart into chambers to separate oxygenated blood from deoxygenated blood.
To produce an electric current, three things are needed: a supply of electric charges (electrons) which are free to flow, some form of push to move the charges through the circuit and a pathway to carry the charges. The pathway to carry the charges is usually a copper wire.
consists of mutual sharing of one or more pair of electron between two atoms. These electron are simultaneouly attracted by the two atomic nuclei, A covalent bond forms when the differences between the electronegative of two atom is too small for an electron transfer to occur to form lons.