Humans' circulatory systems rely on a single heart's regular beat to carry oxygen and nutrients throughout the body. While most organisms have a heart, some (such as members of the echinoderm class, which includes starfish) have not, and some require more than one to keep their systems operating, with a central organ supplemented by smaller hearts to pump blood throughout the body. The survival of a few well-known animals necessitates the beating of several hearts.
The earthworm possesses five pseudo-hearts, which are actually pairs of aortic arches that, despite not being complete organs, function similarly to a heart. The mouth of the earthworm is close to these five arches, each with only one chamber.
Once oxygen has entered the body, one of the five aortic arch pairs acts as the primary organ, pushing blood to the other arches and oxygenated blood to the entire body while employing nerve cells to control the heartbeat.
Cockroaches have only one heart divided into 13 chambers, making them more resistant to failure than the human heart, which only has four chambers. Their multi-chambered hearts are tube-shaped and constructed sequentially, with one chamber pumping blood into the next and so on until the output pressure in the last chamber is optimal.
If one of the chambers fails, the cockroach heart will continue to beat, but it will work less efficiently. Biological experts in India have created an artificial heart in the shape of an onion, with a series of spheres instead of a tube, in the hopes of making it less prone to error than current artificial heart models.
The hagfish, a prehistoric creature that looks like an eel but is classified as a fish, is a prehistoric organism that looks like an eel but is classified as a fish. To help oxygenate its blood, it possesses four hearts and ranging from five to fifteen pairs of gills. The branchial heart, one of the four hearts in the body, pumps blood throughout the body, while the other three function as backup pumps. They scavenge for fish and even dead carcasses to consume at the ocean's deepest depths, where oxygen is scarce. Due to the lack of oxygen in their preferred environment, hagfish hearts have evolved to continue beating for 36 hours without oxygen, whereas other species, such as humans, can suffer irreversible damage within minutes of oxygen deprivation.
4. Octopus and Squid
Inside octopuses and squid, there are three hearts: one main heart that pumps oxygenated blood throughout the body, and two branchial hearts that pump blood from the gills to the main heart for oxygenation.
The makeup of the cephalopod's blood is the major reason for these functions: instead of iron-rich hemoglobin, it is made up of copper-rich hemocyanin, which dissolves straight into the animals' blood, turning it blue. Except in colder, low-oxygen locations like the bottom of the ocean, hemoglobin is usually more efficient at delivering oxygen than hemocyanin, necessitating the branchial hearts to aid the main heart in supplying the essential oxygen to the body.
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