Which of the following is NOT TRUE of animals that have open circulatory systems?

1.They have a mechanism to pump circulatory fluid.

2. They are not vertebrates.

3. They have lower pressure in their circulatory compartments compared to animals with closed circulatory compartments.

4. Almost all of them have specialized gas transporting blood cells

The open circulatory system refers to the kind of circulatory system where there is a lack of separate channels for blood and interstitial fluid. The blood and interstitial fluid in these organisms are always mixed ant thus resulting in the formation of hemolymph.

These organisms do not have true blood and hence the term circulatory fluid is used. There are no blood vessels and hence the fluid keeps flowing in the body cavities.

There are certain advantages to this system. One of them is that there is no variation in blood pressure and thus these organisms have better control of their body temperature.

An open circulatory system is a simple form of the circulatory system present in arthropods and molluscs. They do not have any mechanism to pump their circulatory fluid.

Therefore, the correct option is A.

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