A. BUN stands for blood urea nitrogen. Creatinine is a natural product of muscle breakdown that occurs at a low level in the body. Both BUN and creatinine are filtered by the kidney and excreted in urine. For this reason, BUN and creatinine are used together to measure kidney function.If kidney function begins to decline, BUN and creatinine rise. A normal creatinine depends on muscle mass and age. In general, a normal creatine is 0.5 to 1.2 milligrams per deciliter (mg/dL). A normal BUN is 7 to 20 mg/dL.Remember that different laboratories use different testing equipment, and may have slightly different ranges for normal.n cases of dehydration, BUN may increase in a higher proportion than the creatinine. A normal BUN-to-creatinine ratio is between 10 to 1 and 20 to 1. (For example, a BUN of 14 and a creatinine of 1.2 would be a ratio of 12.).
The two types of stars that end with supernovae are white dwarfs and massive stars that are at least eight times the mass of the sun. Each of these types of stars undergoes a thermonuclear reaction at the end of its life. Keep Learning.
Above 8 solar masses, they explode as supernovae. Between 8 and 15 solar masses the remnant of the explosion ends up as a neutron star; above about 15 solar mass, the remnant collapses catastrophically to become a black hole To clarify the Type 1a vs Type 2 supernovae-massive stars end up as type 2 supernovae.eport Abuse. A small star will go nova, leaving behind a small dwarf star, usually a white dwarf. A very large star will go supernova, and could possibly leave behind a neutron star or a black hole.