Why do some but not all animals have a circulatory system? What
circulatory system? What are additional functions?
What are the components common to all animal circulatory
systems? What’s the difference between and open and closed
circulatory system?
What’s the difference between single circulation and double
circulation? How does this relate to two-, three-, and
four-chambered hearts? What is the third circuit?
Be able to trace the path of blood through the heart and lungs.
Where are AV valves and...