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The circulations in animals

double circulation

What is circulation in animals?

circulation in vertebrates

What is circulation in animals?

The circulatory system in animals has a close relationship with other systems and does so through tubes called blood vessels. Between the vessels are veins that carry deoxygenated blood from the tissues to the heart.

how animal circulation works

For the slowest, smallest and simplest animals (poriferans, cnidarians and flatworms) their movement is enough to mix the internal fluids. Large animals need a circulatory system with a circulating fluid (transporter), conductive vessels (to carry the fluid) and a pumping system (to speed up the process)

how animal circulation works

types of animal circulation

double circulation

closed circulation

types of animal circulation

simple circulationn

open circulation

double circulation

Double circulation systems occur in all vertebrates, except fish. Blood is pumped through a pulmonary circuit to the lungs, where it is oxygenated. The blood fluid then returns to the heart, which pumps oxygenated blood to the body through a systemic circuit.

double circulation

simple circulation

Blood passes through the heart only once in each revolution of the body. It is typical of fish. They have a curved heart with a venous sinus that receives blood from the body, an atrium and a very muscular ventricle.

open circulation

The heart drives the blood through the vessels but it reaches a space where it mixes with the organs and tissues, producing gas exchange.

open circulation

closed circulation

circulatory is the closed one, in which the heart pumps blood through the vessels and never leaves those conduits.

circulation in invertebrates

circulation in invertebrates

Invertebrates can have two types of circulation: open, if the circulating fluid leaves the vessels that conduct it and spreads through the tissues; or closed, when the circulating liquid always moves contained in the vessels.

circulation in vertebrates

Blood is driven by the heart through arteries with elastic walls. These branch into others of smaller diameter, called arterioles, and these into very thin vessels with thin walls, the capillaries.