Question

Which of the following types of fluid(s) is/are found in organisms with open type of circulation?

• A. Plasma
• B. Blood
• C. Hemolymph
• D. Lymph

Answer 1

The correct option is C Hemolymph

Circulatory systems in organisms can be of two types- open and close.
In an open type of circulatory system, a circulating fluid called hemolymph is pumped by heart into the open spaces or body cavities. The hemolymph returns to the heart via small pores called ostia. The organs are directly bathed in the body fluid. It can be found in arthropods and molluscs.
In a closed type of circulatory system, a circulating fluid called blood is pumped by the heart through a closed network of blood vessels. An advantage of this type of circulatory system is that the flow of the circulating fluid can be regulated. It can be found in annelids and chordates. The components of a closed type of circulatory system are circulating fluid (blood or lymph), heart and blood vessels.
Lymph is a colorless fluid which is found in the lymphatic system and carries nutrients, immune cells etc.
Plasma is the straw colored viscous fluid which makes up approximately 55% of the blood volume.