Figuer:
Examine this image, showing an electron transport chain in photosynthesis. 
-What is released at each step in an electron transport chain?
Definitions:
Substantia Nigra
A region of the midbrain involved in the control of movement and implicated in neurodegenerative diseases like Parkinson's disease.
Parkinson's Disorder
A neurodegenerative disorder characterized by motor system symptoms such as tremors, stiffness, and bradykinesia, as a result of dopamine-producing neuron loss.
Dopamine
A neurotransmitter involved in regulating mood, motivation, pleasure, and reward pathways in the brain, often associated with learning and addiction.
Invasive Technique
A medical or scientific method that involves entering the body, often through incisions or insertion of instruments, to diagnose or treat conditions.
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