The main organ of the respiratory system are the _________ .

The ____________ is often called the "wind pipe."

Small blood vessels where oxygen is exchanged for carbon dioxide are called __________ .

The ________________ is the large breathing muscle that contracts to create a vacuum, drawing air into the nose and mouth.

The small tubes within the lungs that transport air to the alveoli are called _________ .

The respiratory system removes a harmful waste product called __________ .

_________ are tiny air sacs in the lungs which are surrounded by capillaries.

The human body contains two ____________ which carry air into the lungs.

The diaphragm separates the heart and the lungs from the ___________ .

How many chambers make up the human heart?

The thin muscular wall that separates the right side of the heart from the left side is called the ______

Vessels that carry blood away from the heart are called ___.

Each upper chamber of the heart is called a(n) ___.

The ____ pumps oxygen-rich blood out of the heart to the rest of the body.

Each lower chamber of the heart is called a(n) ___.

Vessels that carry blood toward the heart are called ___.

The ___ carries the oxygen-rich blood from the lungs to the heart.

Deoxygenated blood from the superior portion of the body enters the right atrium through the

Deoxygenated blood from the inferior portion of the body enters the right atrium through the

Deoxygenated blood enters the ______ atrium.

What valve will deoxygenated blood pass through as it leaves the right atrium?

What chamber of the heart pumps deoxygenated blood to the lungs?