Guanidine is a fairly strong amine base that is attached to the amino acid arginine. Draw three resonance forms for the conjugate acid of guanidine. 
guanidine
Definitions:
SA Node
The SA Node, or sinoatrial node, acts as the heart's natural pacemaker, generating electrical impulses that initiate the heartbeat.
Right Ventricle
One of the four chambers of the heart, responsible for pumping oxygen-depleted blood to the lungs.
Pulmonary Semilunar
Referring to the pulmonary semilunar valve, one of the heart's valves that prevents blood from flowing back into the right ventricle from the pulmonary artery.
Tricuspid
Referring to a valve in the heart that lies between the right atrium and the right ventricle, ensuring the flow of blood in one direction.
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