18. Statement - 1 (Assertion) Crocodiles and alligators have completely four chamber heart and teeth are present in sockets. Statement - II (Reason) Urinary bladder is absent in crocodiles. O Both statements I & II are true and statement II is the explanation of statement Both statements I & Il are true and statement ll is not the explanation of statement O Statement is true but statement II is false. O Statement is false but statement II is true.
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The human heart consists of four chambers – two atria and two ventricles – that expand and contract in order to drive blood containing oxygen and nutrients throughout the body. The atria, which have relatively thin walls, fill first, before squeezing the blood into the much stronger ventricles, which then contract to send blood coursing through our arteries. Most reptiles have two atria and one ventricle. The only exceptions are the 23 living species of crocodilians (alligators, caimans, crocodiles and gharials) who, like birds and mammals, have four-chambered hearts with two atria and two ventricles (Jones, 1996; Jensen et al., 2014).
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