cardiac muscle tissue

tissue muscle cardiac heart organ cardio wall anatomy muscular vector cell human system body structure type fiber contraction branch purkinje uninucleated epicardium pericardial pericardium myocardium bundle biology cartilage diagram illustration medical tendon function histology hypotonia myocarditis hypertrophic cardiomyopathy graphic health density physiology myofibrils pattern involuntary woman silhouette microscope cellular infographic