For most Parkinson's patients, the cause lies somewhere in the middle. While many Parkinson's patients report one or more family members with the disease, it is not always clear that one or several genes are the cause.
In fish there are two aorta: the ventral aorta that carries blood to the gills, and a separate dorsal aorta that carries the blood to the body.This works well with a fish's two chambered heart.n fish there are two aorta: the ventral aorta that carries blood to the gills, and a separate dorsal aorta that carries the blood to the body.
The Dorsal Blood Vessels located on the dorsal/top side. The Ventral Blood Vessels are located on the underside/ventral side of the worm. The Ventral vessels are to transport blood to the back of the Earthworm's body, whereas Dorsal vessels are to transport blood to the front of the body. These vessels supply blood to organs.