Question

In _________, a true heart is not found​

Answer 1

Answer:

In invertebrates, a true heart is not found.

Explanation:

• The animal kingdom is broadly classified into vertebrates and invertebrates.
• Vertebrates are those organisms which have a notochord from which a vertebral column has developed which protects the spinal cord.
• Invertebrates are those organisms which do not have a notochord.
• Invertebrates do not have a muscular organ to pump blood inside blood vessels.
• Most of them have an open circulatory system without blood vessels.

Answer 2

Answer:

The answer is Earthworm. In earthworms, a true heart is absent.

Explanation:

An earthworm is a segmented invertebrate and belongs to the group of annelids.  Earthworms don’t have a true heart, heart like structure in them is called pseudohearts. They can have five, 10, or 0 hearts (rather pseudohearts). They have 10 single arches (if each pair is counted as two separate structures) or 5 pairs of aortic arches that run along the body’s length of the earthworm. And if we define heart on the basis of chambers then earthworms don’t have any heart because of the absence of chambers. That is why these are called pseudohearts. The earthworm’s hearts sit near the creature’s mouth in 5 pairs and function like a human’s heart, though they breathe oxygen through their skin and need moisture for respiration. Their circulatory system is closed which means their blood flows in the vessels not free-flowing.

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