Circulatory System In Invertebrates

Question 0

Cnidarians

Answer 0

They are in direct contact with the internal or external environment so there is no need for a circulatory system

Question 1

Protozoans

Answer 1

Movement of gases and nutrients is accomplished by simple diffusion

Question 2

Arthropods

Answer 2

• have an open circulatory system
• blood is in direct contact with the body tissues
• blood flows through a dorsal vessel Nd into spaces called sinuses where exchange occurs

Question 3

Annelids

Answer 3

-earthworm
-closed circulatory system
-delivers materials that are not in dirext contact with the external environment
-blood is confined to blood vessels
-