When an object is burning, two atoms of oxygen (in the air) combine with one atom of carbon (from the

substance burning). this forms carbon dioxide gas. explain how the law of conservation of matter applies to

this reaction.

2. a piece of wood is burned, and a small amount of ashes are formed. explain why the original piece of wood

and the resulting ashes will not weigh the same.

Which medullary index indicates a human hair? a. 0.653 b. 0.733 c. 0.516 d. 0.256

What is the most appropriate method of gaining weight (muscle mass)

The kidney filters potentially toxic substances in the blood, and thus “clears” the blood of those substances. this clearance function is dependent upon and proportional to the diffusion gradient of the substance across filtering capillaries, i.e. if the concentration of the substance is doubled, twice as much will be cleared from each ml of blood that is filtered. suppose that the body produces a constant amount of a substance x per unit of time. the kidneys eliminate substance x at a rate directly proportional to the concentration of the substance and the volume of blood cleared each minute (c): elimination = c × [x], where [x] is the steady-state concentration of substance x. imagine an individual with an initial concentration of x equal to [x]0 who develops kidney disease. her baseline clearance c0 drops to one half of the original (½c0). what is the new steady state concentration of x? (for simplicity, assume that substance x is 100% filtered by the kidney).