Answer:
The major structures of circulatory system are Heart, Arteries, Veins and Capillaries.
Explanation:
Heart: The heart is a hollow, muscular organ that pumps blood. It consists of
two pumps that lie side by side.
Arteries: Arteries carry blood from the heart. Arteries are elastic vessels that
transport blood away from the heart.
Veins: Veins are elastic vessels that transport blood to the heart.
Capillaries: Capillaries are extremely small vessels. The nutrients and oxygen
exchange usually occurs in the capillaries.
