Mention the reason, how do the different number of Heart chambers formed in vertebrates ?
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(a) Two chambered heart is present in organism like fishes. Only one atria and one ventricle is present which are not separated and hence mixing of oxygenated and deoxygenated blood blood occurs. <br> (b) Three chambered heart develops after the division of auricle into right and left halves as in amphibian. Mising of oxygenated and deoxygenated blood occurs in ventricles. <br> (c ) An intermidiary heart is present in reptiles in which ventricle get partially divided through a septum which is incomplete. e.g., Crocodiles, thus having four-chambered heart. <br> (d) In four chambered heart both the auricle and ventricle are divided into two halves and thus no mixing of oxgyenated and deoxygenated blood occurs.
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The answer to the given question is written below.
- The Heart is the centre of the circulatory system whose primary objective is to pump blood via pulmonary and systemic systems of the body network.
- The question relates to 'Vertebrate Heart'.
- Here, all chordates possess a dorsal nerve cord and a notochord that is supported by a surrounding muscle.
- Vertebrates are identified through a multi-chambered heart with a closed vascular system and the capillaries are lined with endothelial cells.
- These hearts are formed by folding of the lateral cardiogenic mesodermal layer on the embryonic disk to create the tubular heart.
- The heart section in the tube, loops around to produce a protruding ventricle and atrium, leaving the remaining inner tubular system in its original tubular appearance.
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