Abstract: As nanomedicine molecules, A and B enter the human body to neutralize a specific enzyme. During investigation, they encountered hydrogen sulfide whom they consider to be abnormal. Following the trail of hydrogen sulfide, they investigate its production sites, uncover the mechanisms behind its formation, and journey to its destination. Ultimately, they discover that hydrogen sulfide is not the toxic gas; rather, it serves as a kind of gas signaling molecule that can protect cardiac muscle.

Key words: Hydrogen sulfide, Gas signaling molecules, Cardiac muscle