The connector between veins and arteries

What protein helps red blood cells carry oxygen?

Which side of the heart has deoxygenated blood?

Which side of the heart is stronger/bigger?

What is the biggest artery in the body and also is connected to the heart?

Which statement best describes the function of the respiratory passageways?

A humidifier is a device that adds moisture to dry air. Which part of the human respiratory system has the same function?

Most gas exchange occurs between the

When we exhale, air passes from the trachea directly into the

An allergic reaction characterized by the constriction of bronchial tubes is know as

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