Enables several functions, including ATP binding activity; ATP hydrolysis activity; and identical protein binding activity. Involved in aging; cellular response to organonitrogen compound; and muscle contraction. Located in myosin filament and sarcomere. Part of muscle myosin complex. Biomarker of congestive heart failure; hypertension; hypothyroidism; and myocardial infarction. Human ortholog(s) of this gene implicated in cardiomyopathy (multiple); congenital heart disease (multiple); distal myopathy 1; and hyaline body myopathy (multiple). Orthologous to human MYH7 (myosin heavy chain 7). [provided by Alliance of Genome Resources, Apr 2022]