5. What is an open circulatory
system?

Gap-fill exercise

Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!
Open circulatory system the one in
blood does not only
inside blood but it also in
cavities that tissues. In the
circulatory system the pressure is
low generally the blood (
hemolymph) has low .

Arthropods, molluscs (the
are exception) and have
open circulatory .