Anatomy of the Heart. Your heart is located under your ribcage in the center of your chest between your right and left lungs. Its muscular walls beat, or contract, pumping blood to all parts of your body. The size of your heart can vary depending on your age, size, and the condition of your heart.
In anaerobic respiration, NADH loses its electrons to other molecules in the process of fermentation for the purpose of regenerating the NAD+ needed to continue oxidizing organic molecules to produce ATP by substrate-level phosphorylation.
The potential of NADH and FADH 2 is converted to more ATP through an electron transport chain with oxygen as the terminal electron acceptor. Most of the ATP produced by aerobic cellular respiration is made by oxidative phosphorylation.