4. Number the organisms from 1 (most abundant) to 8 (least abundant) __5__ Mammals __2_ Molluscs _4_ Roundworms __1_ Arthropods __3_ Flatworms. 5. What is biodiversity (click on the purple links for definitions): ____ The many different types of organisms that exist.
Factors that Decrease BUN. 1  Low-protein diet, malnutrition or starvation (R). 2  Impaired liver activity due to liver disease (R). 3  Genetic deficiency of urea cycle enzymes (R). 4  Higher IGF-1 and growth hormone. 5  Anabolic steroids, which decreases protein breakdown. 6  Overhydration, or drinking a lot of water. 7  Pregnancy (due to increased plasma volume) (R).
The BUN measures the amount of urea nitrogen in the blood. Urea is formed in the liver as the end product of protein metabolism and digestion. The urea is deposited in the blood and transported to the kidneys for excretion. The BUN serves as an index of the function of the liver and the kidneys. Patients who have elevated BUN levels are said to have azotemia or be azotemic. Almost all renal diseases cause an inadequate excretion of urea, which causes the BUN to rise. Since the synthesis of urea depends on the liver, severe liver disease can cause a decreased BUN.