1. The primary function of the______
(respiratory system, circulatory
system) is to transport materials throughout the entire all parts of the body.

2. _______(Lungs, Heart) is the muscular organ of the circulatory system that
pumps blood to the different parts of the body.

3._______(Capillaries, Blood) carries carbon dioxide to the lungs for exhalation
and picks up oxygen.
4. _______(Valves, Blood vessels) are the flaps of muscles that prevent blood
from back flowing.

5._______ (Capillaries, Arteries) are the smallest blood vessels in the body that
connects smallest arteries to the veins.


Paki sagut po. please ​