Which circulatory system is absent in humans?

  • A
    Heart-circulatory system
  • B
    Pulmonary circulatory system
  • C
    Renal portal system
  • D
    Hepatic portal system

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Which of the following is $NOT$ a characteristic feature of open circulation?

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$I$. It prevents the mixing of oxygenated and deoxygenated blood in the heart.
$II$. It circulates only oxygenated blood through the heart.
Choose the correct option accordingly.

Differentiate between: Open circulatory system and closed circulatory system.

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