The figure below shows the evolutionary path of a star on the HR diagram.At which point does helium fusion begin? 
Definitions:
NADH Reductase
An enzyme involved in the electron transport chain that helps in the transfer of electrons from NADH to other molecules.
Hydrogen Ions
Positively charged ions (H+) that play a significant role in chemical reactions, pH balance, and cellular processes.
Electron
Negative subatomic particle, moving about in an energy level around the nucleus of an atom.
Aerobic Respiration
The process of producing cellular energy involving oxygen by breaking down organic molecules.
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