Which of the labeled steps in the diagrams involve contraction the diaphragm? 
Definitions:
Monocytes
A type of white blood cell that plays a critical role in the immune system by killing pathogens, removing dead cells, and stimulating the action of other immune cells.
Sympathetic System
A part of the autonomic nervous system that activates what is often termed the fight or flight response, preparing the body for action.
Parasympathetic System
Part of the autonomic nervous system that conserves energy as it slows the heart rate, increases intestinal and gland activity, and relaxes sphincter muscles.
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