What is the Circulatory System?
Network of cylindrical vessels
Invertebrate Circulatory Systems
Sponges, Jellyfish and nematodes lack circulatory system. So must always be in direct contact with water.
While larger invertebrates just have an open circulatory system
RED BLOOD CELLS
ERYTHROCYTES
WHITE BLOOD CELLS
LEUKOCYTES
What are the first responders for leukocytes? and the other leukocyte group
Granulocytes and agranulocytes
How are Platelets formed?
From the disintegration of large cellls called megakaryocytes, form clots