The most important part is a _______
muscle
Blood _____ move oxygen and nutrients, too
vessels
Blood vessels move _____ and nutrients too
oxygen
The red blood vessels are called _____
arteries
The blue blood vessels are called _____
veins
Blood vessels move oxygen and _____, too
nutrients
The circulatory system moves the _______ around
blood
The most important part is a muscle, it's the ______
heart
The ________ system moves the blood around
circulatory