Q76 / 200 · MHT CET - Medical 2026 (23 April Shift 2) · Biology
Read the following statements about open circulatory system and choose correct statements.
1. Blood is circulated through the body cavities.
2. Exchange of material takes place directly between blood and cells.
3. The blood flows with high pressure.
4. It is found in arthropods and most molluscs.
1. Blood is circulated through the body cavities.
2. Exchange of material takes place directly between blood and cells.
3. The blood flows with high pressure.
4. It is found in arthropods and most molluscs.
- Correct answerA1,2 and 4 only
- B1 and 3 only
- C2 and 3 only
- D1,2,3 and 4
Solution
In an open circulatory system, blood is pumped by the heart into large open spaces or body cavities called hemocoels. Thus, blood is circulated through the body cavities.
Since the blood is not confined to blood vessels, the cells and tissues are directly bathed in it, allowing the exchange of materials to take place directly between the blood and the cells.
Because the blood flows into large open spaces rather than being confined within narrow vessels, it flows with low pressure, not high pressure.
This type of circulatory system is characteristic of arthropods and most molluscs.
Therefore, statements 1, 2, and 4 are correct, while statement 3 is incorrect.
Answer: 1,2 and 4 only
Since the blood is not confined to blood vessels, the cells and tissues are directly bathed in it, allowing the exchange of materials to take place directly between the blood and the cells.
Because the blood flows into large open spaces rather than being confined within narrow vessels, it flows with low pressure, not high pressure.
This type of circulatory system is characteristic of arthropods and most molluscs.
Therefore, statements 1, 2, and 4 are correct, while statement 3 is incorrect.
Answer: 1,2 and 4 only
Hence, the correct answer is option: 'A'.