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Question
In the course of evolution, a heart for pumping blood was first found in which of these?
In the course of evolution, a heart for pumping blood was first found in which of these?
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Solution
The correct option is B Annelids
One of the simplest types of closed circulatory systems is found in annelids such as the earthworm. The earthworm, which is perhaps the most common of all the annelids, has five heart-like structures called aortic arches. Earthworms have two main blood vessels; a dorsal and a ventral vessel, which carry blood towards the head and the tail respectively. Blood is moved along the dorsal vessel by waves of contraction in the wall of the vessel.
One of the simplest types of closed circulatory systems is found in annelids such as the earthworm. The earthworm, which is perhaps the most common of all the annelids, has five heart-like structures called aortic arches. Earthworms have two main blood vessels; a dorsal and a ventral vessel, which carry blood towards the head and the tail respectively. Blood is moved along the dorsal vessel by waves of contraction in the wall of the vessel.
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