Basis of Animal Classification · NCERT Biology

In an open circulatory system, the blood is:

Circulated through a series of vessels of varying diameters
Pumped out of the heart into open spaces called sinuses
Contained entirely within capillaries
Absent and replaced by water

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Correct answer: Pumped out of the heart into open spaces called sinuses

In an open system, found in Arthropods and Molluscs, tissues and organs are directly bathed in blood. Closed systems, conversely, keep blood confined to vessels, allowing for higher pressure and regulation.

Difficulty: Medium Question 13 of 20

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In an open circulatory system, the blood is:

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