Study to Assess the Effect of Omecamtiv Mecarbil (OM) on QT/QTc Intervals in Healthy Adults

Inclusion Criteria: * Subject has provided informed consent before initiation of any study-specific activities/procedures. * Healthy male or healthy female subjects greater than or equal to 18 to less than or equal to 50 years of age. * No history or evidence of clinically relevant medical disorders as determined by the Investigator at Screening. * Physical examination at Screening and vital signs, clinical laboratory values, and electrocardiogram (ECG) at Screening and Day -1 of each period are clinically acceptable to the Investigator. * Body mass index (BMI) greater than, or equal to 18.0 kg/m\^2 and less than, or equal to 30.0 kg/m\^2. * Willing to maintain current general diet and physical activity regimen. Exclusion Criteria: * History or evidence of clinically significant disorder, condition, or disease not otherwise excluded that, in the opinion of the Investigator, would pose a risk to subject safety or interfere with the study evaluation, procedures, or completion. * Any users of tobacco- or nicotine-containing products within 6 months before Day -1 of Part A. * History suggestive of esophageal (including esophageal spasm, esophagitis), gastric, or duodenal ulceration or bowel disease (including, but not limited to, peptic ulceration, gastrointestinal bleeding, ulcerative colitis, Crohn's disease, or irritable bowel syndrome); or a history of gastrointestinal surgery other than uncomplicated appendectomy. * History or current signs or symptoms of cardiovascular d…