Which of the followng cannot be taken as a feature of open type circulatory system ?

Options

A. Low pressure system
B. Well-regulated blood supply to different organs
C. Blood returns to the heart slowly
D. Non-formation of capillaries

Answer

To determine which of the following cannot be taken as a feature of an open type circulatory system, we will analyze each option provided:

1. **Low pressure system**:
- In an open type circulatory system, blood flows freely through cavities and does not travel through a network of blood vessels like in a closed system. This leads to a low pressure system because there are no vessels to maintain high pressure.
- **Conclusion**: This is a feature of an open type circulatory system.

2. **Well regulated blood supply to different organs**:
- In a closed type circulatory system, blood is contained within vessels, allowing for precise regulation of blood flow to various organs. In contrast, the open type circulatory system lacks such regulation because blood is not confined to vessels and flows freely into body cavities.
- **Conclusion**: This cannot be taken as a feature of an open type circulatory system.

3. **Blood returns to the heart slowly**:
- Due to the low pressure and the absence of blood vessels in an open type circulatory system, the return of blood to the heart is indeed slow.
- **Conclusion**: This is a feature of an open type circulatory system.

4. **Non formation of capillaries**:
- Open type circulatory systems do not have capillaries, as blood is not confined to vessels. Instead, it bathes the organs directly in body cavities.
- **Conclusion**: This is also a feature of an open type circulatory system.

Based on the analysis, the option that cannot be taken as a feature of an open type circulatory system is **"well regulated blood supply to different organs."**