In an open circulatory system:

  • A
    There is no distinction between the blood and the tissue fluid.
  • B
    Tissue fluid is absent.
  • C
    There is no need for blood vessels.
  • D
    Open spaces or sinuses are absent.

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The hepatic portal vein drains blood to the liver from:

Identify $X$ and $Y$ in the given schematic diagram of blood circulation.

State the location of the hepatic portal system.

Which of the following statements is correct regarding human circulation?

Define/Explain the following terms:
$(i)$ Open circulatory system
$(ii)$ Closed circulatory system

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