After thus disproving the erroneous views of the heart's action, Harvey next proceeds to discuss the movements in the arteries as they are seen in the dissection of living animals. He shows that the pulsation of the arteries depends directly upon the contraction of the left ventricle and is due to it, whilst the contraction of the right ventricle propels its charge of blood into the pulmonary artery which is distended simultaneously with the other arteries of the body. When an artery is divided or punctured the blood is forcibly expelled from the wound at the instant when the left ventricle contracts, and when the pulmonary artery is wounded the blood spurts forth with violence when the right ventricle contracts. So also in fish, if the vessel leading from the heart to the gills be divided the blood flows out forcibly when the heart becomes tense and contracted. These facts enabled Harvey to disprove the current theory that the heart's systole corresponded with the contraction of the arteries which then became filled with blood by a process of active dilatation, as bellows are filled with air. He illustrated this by a homely method which he had been accustomed to use in his lectures for years. He says that "the pulses of the arteries are due to the impulses of the blood from the left ventricle may be illustrated by blowing into a glove, when the whole of the fingers will be found to become distended at one and the same time and in their tension to bear some resemblance to the pulse."