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.
NADH and FADH (products of the citric acid cycle) are processed in the mitochondria by removing the hydrogen atoms (electrons and protons) and combining them with oxygen form water molecules H2O. the mitochondria process the NADH and FADH to produce ATP energy. Each NADH produces 3 ATP. Each FADH produces 2 ATP.