Hemocoel

Definition

Hemocoel is a primary body cavity of most invertebrates, containing circulatory fluid. It functions as part of the open circulatory system, where blood directly bathes internal organs.

5 Must Know Facts For Your Next Test

1. In arthropods and some mollusks, the hemocoel serves as the main body cavity.
2. The hemocoel contains hemolymph, a fluid analogous to blood in vertebrates.
3. Unlike coelomates, organisms with a hemocoel lack a true coelom.
4. It plays a crucial role in nutrient distribution and waste removal.
5. Hemocoels are present in many invertebrates such as insects and crustaceans.

Review Questions

• What is the primary function of a hemocoel?
• Which types of animals typically possess a hemocoel?
• How does hemolymph within the hemocoel differ from vertebrate blood?

Related terms

Coelom:

A fluid-filled body cavity completely lined by mesoderm found in most multicellular animals.

Hemolymph: The circulatory fluid found within the hemocoel of arthropods and some other invertebrates.

Open Circulatory System: A type of circulatory system where blood bathes organs directly rather than being confined to vessels.