a) Fullness of the venous vessel of the liver in an animal of the control group after physical exertion. H and E staining. 10Xoc.lens, 40Xobj.lens; b) Venous hyperemia of the liver triad of animals when using lemongrass after physical exertion. H and E staining. 10Xoc.lens, 40Xobj.lens; c) Full blood vessels of the liver of animals when using the drone brood after physical exertion. H and E staining. 10Xoc.lens, 40Xobj.lens.