This graph shows the dose-response curve for a lethal dose of a particular toxin: Dose response curve related to mortality for a particular toxin. Doses up to 1,000 mg per kg result in death for 0 percent of those exposed to the toxin; a dose of 2,000 mg per kg results in death for 6 percent of those exposed to the toxin; a dose of 5,000 mg per kg results in death for 20 percent of those exposed to the toxin; a dose of 10,000 mg per kg results in death for 50 percent of those exposed to the toxin; and a dose of 20,000 mg per kg results in death for 100 percent of those exposed to the toxin.

According to the graph, approximately how much larger is the LD50 dose for this toxin than the threshold level?

3,000 mg/kg
8,000 mg/kg
9,000 mg/kg
10,000 mg/kg

What is an endocrine function? (apex) a.esophageal glands release mucus into the esophagus b.salivary glands release saliva into mouth c.swear glands release sweat to the skin d.the pineal gland releases melatonin into the bloodstream

Which mechanism of transport takes place when solute particles move from a region of high concentration to a region of low concentration? active diffusion isotonic osmosis

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).