Circulatory System

1. The primary organ of the circulatory system is the ___________.

Our circulatory system comprises our heart, blood vessels, and the blood they contain.

• True

• False

_____ carry blood to all parts of our body.

• Heart muscles

• 1. Capillaries

• Blood vessels

• 1. Arteries

A special muscle that makes our heart is called _____ _____.

Heart muscle allows our heart to ____ _____ continuously to all parts of our body.

• pump blood

• pump oxygen

Our blood carries ______, digested food, and water to all part of our body.

Our blood only contains red cells

• True

• False

Oxygen is carried around the body by ___ cells.

• red

• white