Question

Humans have a

• A. Closed circulatory system
• B. Circulatory system
• C. Open circulatory system
• D. None of the above.

Answer 1

The correct option is A Closed circulatory system

The circulatory patterns are of two types open or closed. Open circulatory system is present in arthropods and molluscs in which blood pumped by the heart passes through large vessels into open spaces or body cavities called sinuses. Annelids and chordates (example humans) have a closed circulatory system in which the blood pumped by the heart is always circulated through a closed network of blood vessels. This pattern is considered to be more advantageous, as the flow of fluid can be more precisely regulated.