Question

The type of circulatory system in humans is

• A. Open
• B. Closed
• C. Both open and closed
• D. Half open and half closed

Answer 1

The correct option is B Closed

• The circulatory system constitutes of blood, blood vessels, lymph, lymphatic vessels, and heart.
• It is divided into two types:-

(i) Open circulatory system: In this system, the blood is pumped by the heart that diffuses directly into the body cavities and is made available to the tissues. For example, crustaceans, molluscs, insects, etc.

(ii) Closed circulatory system: In this system, the blood is pumped by the heart into the blood vessels system. Here the blood always circulates in the closed vessels, heart and never is in direct contact with body cavities. Thus the name. For example, human beings, dogs, rats, cats, etc.

So, the correct answer is option B.