A hormone raises the blood calcium level from 7.5 mg/dl to 10.5 mg/dl in 12 minutes. What is the average rate of increase of calcium concentration per minute?
Answer
0.25 mg/dl per minute
The correct answer is 0.25 mg/dl per minute — State the average rate as 0.25 mg/dl per minute.
Step-by-step solution
- Calculate the change in concentration: 10.5 mg/dl - 7.5 mg/dl = 3.0 mg/dl.
- Identify the time interval: 12 minutes.
- Divide the change by the time interval: 3.0 mg/dl ÷ 12 min = 0.25 mg/dl per minute.
- State the average rate as 0.25 mg/dl per minute.
Common mistake: Dividing the initial concentration by time instead of the net change.
Concept tested: Rate of change of concentration
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