Showing the difference between Open and Closed circulatory system respectively.
The circulatory system is an organ system that permits blood and lymph circulation to transport nutrients (such as amino acids and electrolytes), oxygen, carbon dioxide, hormones, blood cells, etc., to and from cells in the body to nourish it and help to fight diseases, stabilize body temperature and pH, and to maintain homeostasis.
All animals except the simplest kinds have some type of circulatory system. Primitive animals like the sponge and the hydra have no circulatory systems. All their cells are in direct contact with the environment.
Octopuses have a more advanced circulatory system than other invertebrates
They consists of 3 hearts. They have a closed circulatory system. This means that oxygen and nutrients are delivered to different parts of the animal through vessels. This allows for more oxygen to be delivered to organs such as the brain. An octopus has three hearts to ensure maximum blood–flow throughout the whole body of the octopus. The earthworm has a closed circulatory system where blood is pumped by the heart through arteries, veins, and capillaries. The circulatory system in which the blood is confined to blood vessels is called closed circulatory system. The heart pumps blood through these vessels to different organs of the body. This system is efficient way of transporting blood than an open circulatory system. Few animals like earthworm, squids, octopus, and all vertebrates, like humans etc have this type of system. Oxygen is carried by hemoglobin that is dissolved in the blood.
The grasshopper, as a representative animal of the arthropods, has an open circulatory system. After blood is pumped by the heart into an artery, it leaves the vessel and seeps through spaces called sinuses or hemocoels as it feeds body cells. The blood then moves back into a vein and circulates back to the heart. This system lacks capillaries. Arthropod blood is clear and does not carry oxygen.
The human circulatory system supplies the cells of the body with the food and oxygen needed to survive. At the same time, it carries carbon dioxide and other wastes away from the cells. The circulatory system also helps regulate body temperature and carries substances that protect the body from disease. In addition, the system transports chemical substances called hormones, which help regulate the activities of various parts of the body.