Question

a 23 - year old male patients lab work reveals decreased blood urea nitrogen (bun). what organ is most likely involved with these findings?
a) bone
b) pancreas
c) kidney
d) heart
e) liver

Explanation:

Blood Urea Nitrogen (BUN) is a measure of the amount of urea nitrogen in the blood. Urea is produced in the liver as a by - product of protein metabolism. If there is a problem with the liver, it may not be able to produce urea at a normal rate, leading to decreased BUN levels.

• Bones are not directly involved in urea production or metabolism.
• The pancreas is mainly involved in digestion (producing pancreatic enzymes) and blood sugar regulation (producing insulin and glucagon).
• The kidney's main role in relation to BUN is to excrete urea. Decreased BUN due to kidney issues is less common compared to liver - related causes (in the absence of over - hydration which can also lower BUN, but the question doesn't mention that).
• The heart's function is to pump blood and is not directly related to urea production.

Answer:

e) Liver