Question

What do you call a circulatory system where blood flows through tubes called blood vessels?

• A. Closed circulatory system
• B. Open circulatory system
• C. Ductless circulatory system
• D. Vessel circulatory system

Answer 1

The correct option is A

Closed circulatory system

A circulatory system is said to be closed when the blood flows only through a network of blood vessels, like in humans. The open circulatory system is present in animals like cockroaches where blood flows through the body cavity. No blood vessels are present in these animals.