The importance of blood circulating through the lungs
How waste products in the blood are removed from the body (Look carefully at this concept. Remember the two types of waste (gases and food waste). Be able to explain both ways.)
The two sides of the heart and the type of blood it contains
The names of the organs that make the digestive system. (Read the digestive system carefully. Part of it also belongs to the excretory system so know those parts too!)
The part of the circulatory system that carries oxygen to cells
Understand:
The organ that allows digested food to enter the blood
Why your heart beats faster when you are running (Make the connection with the heart, blood, and cells.)
The importance of filtering waste materials from the blood
What happens as blood passes through the capillaries in the small intestine