Multiple choice

The flow of blood in the animals having four chambered heart is called

  1. single circulation

  2. triple circulation

  3. double circulation

  4. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Animals with four-chambered hearts have double circulation: pulmonary circulation (heart to lungs and back) and systemic circulation (heart to body and back). This prevents mixing of oxygenated and deoxygenated blood. Single circulation occurs in fish with two-chambered hearts.

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