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Choose the incorrect statement
Option: 1
The closed circulatory system increases the efficiency of circulation and regulates blood flow.
Option: 2
In the closed circulatory system, blood does not come in direct contact with tissue cells.
Option: 3
In the open circulatory system, the blood comes in direct contact with tissue cells.
Option: 4
The open circulatory system is found in annelids, echinoderms, some molluscs and all vertebrates
Answers (1)
Types of the circulatory system
- The two basic types of circulatory systems that have evolved in animals are open circulatory system (in many invertebrates) and closed circulatory system (in vertebrates).
- These circulatory systems can be differentiated by the presence or absence of capillaries at tissue level
Open circulatory system
- In this system, the blood comes in direct contact with tissue cells.
- Blood may or may not flow in larger blood vessels
- When vessels are completely absent, blood flows in blood sinuses or lacunae or open spaces e.g arthropods
- In most molluscs, blood flows in larger blood vessels but at tissue level vessels are absent
Closed circulatory system
- In this system, blood does not come in direct contact with tissue cells.
- In this circulation, fine blood vessels called capillaries are present at the tissue level to prevent direct connectivity of tissue and blood, e.g. in annelids, echinoderms, some molluscs and all vertebrates
- The closed circulatory system increases the efficiency of circulation and regulates blood flow.
Hence, the correct answer is option d.
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