1.6

Question 1

What are the three basic types of circulatory systems?

Answer 1

• Open Circulatory system
• Double Closed Circulatory system
• Single Closed Circulatory system

Question 2

Which group of species usually contains an open Circulatory system , and why?

Answer 2

• Invertebrates
• They have a larger surface area to volume ratio compared to vertebrates but diffusion alone is NOT sufficient to reach their energy demands. So they have a circulatory system to supply the oxygen and glucose fast enough.

Question 3

Open Circulatory systems usually lack ……………. and ……………….. which closed circulatories have.

Answer 3

• Blood vessels

- Heart

Question 4

Name an animal which contain the 3 types of circulatory systems respectively.

Answer 4

• Smaller Insects, jellyfish, some shellfish…etc
• All mammals and birds
• Fish for single closed circulatory system