Small Cardioactive Peptide B (SCPB) is primarily studied for its role in regulating heart function in various organisms. It has been found to influence cardiac muscle contractions, making it a subject of interest in cardiovascular research. SCPB is used in experimental studies to understand its effects on heart rate and rhythm, particularly in invertebrates like mollusks, where it acts as a neuromodulator. This peptide helps researchers explore mechanisms of cardiac regulation and potential applications in treating heart-related disorders. Its ability to modulate heart activity also makes it a valuable tool in neurobiology studies, where it aids in understanding the interaction between the nervous system and cardiac function.