SCIENCE
CIRCULATORY SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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two-chambered heart; lack capillaries
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four-chambered heart; blended oxygenated and deoxygenated blood
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two-chambered heart; capillaries
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four-chambered heart; separate oxygenated and deoxygenated blood
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Detailed explanation-1: -The circulatory system in birds and mammals consists of oygenated and deoxydenated blood. However, they have a double circulation system where the oxygenated as well as deoxygenated blood remain separate. This is essential to maintain the body temperature efficiently over a wide range.
Detailed explanation-2: -In mammals and birds, the heart is also divided into four chambers: two atria and two ventricles (figure d). The oxygenated blood is separated from the deoxygenated blood, which improves the efficiency of double circulation and is probably required for the warm-blooded lifestyle of mammals and birds.
Detailed explanation-3: -The mammalian lung has reciprocating ventilation with large terminal air spaces (alveoli) while the avian lung has a flow-through system with small air capillaries. As a result the environment of the pulmonary capillaries is very different between the mammals and birds.
Detailed explanation-4: -Thus, the correct answer is option A-Analogous.