a) Venous myocardial hyperemia of an experimental animal using lemongrass. H and E staining. 10Xoc.lens, 40Xobj.lens; b) Venous myocardial hyperemia when using drone brood. H and E staining. 10Xoc.lens, 40Xobj.lens; c) Marked venous hyperemia of the myocardium of the control group of animals. H and E staining. 10Xoc.lens, 40Xobj.lens.