Use the database table below to answer the following questions. 
-What is referential integrity? What happens when a database does NOT have or enforce referential integrity?
Definitions:
Right Ventricle
The chamber within the heart that is responsible for pumping oxygen-depleted blood to the lungs for oxygenation, located in the lower right portion of the heart.
Aorta
The largest artery in the body, originating from the left ventricle of the heart and extending down to the abdomen, distributing oxygenated blood to all parts of the body.
Tunica Media
The middle layer of the wall of a blood vessel, composed primarily of smooth muscle and elastic tissue.
Smooth Muscle
Involuntary, non-striated muscle found in the walls of internal organs and blood vessels, controlled by the autonomic nervous system.
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