1
Blood in the ___ will flow through the pulmonary arteries next.
2
The walls of the ___ are the most muscular part of the heart.
3
The right side of the heart pumps ___ blood to the lungs.
4
The cardiovascular system helps the body maintain ___ by transporting oxygen, nutrients, and wastes.
5
___ are the thinnest type of blood vessels.
6
Blood in the ___ will flow into the right ventricle next.
7
Blood becomes ___ in the capillaries of the lungs.
8
Blood returning to the heart from the lungs will enter the ___ of the heart first.
9
The ___ circuit sends blood from the heart to the lungs and back to the heart.
10
Blood in the ___ will flow into the right atrium next.
11
The ___ circuit sends blood from the heart to all of the organ systems in the body.
12
Blood vessels that carry blood away from the heart are called ___.
13
___ in the heart and veins prevent blood from flowing backwards.
14
After blood leaves the left ventricle it flows through the ___.
15
Blood returning to the heart from the lungs flows through the pulmonary ___.
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