Normally, the Body's Storage and Re-Utilization of Vitamin B₁₂ Prevents

question 53

Multiple Choice

Normally, the body's storage and re-utilization of vitamin B₁₂ prevents a primary or secondary deficiency from occurring until after about which of the following times?

• A) 3 days
• B) 3 weeks
• C) 3 months
• D) 3 years

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Definitions:

Nonlinear Dose Response

A relationship in which the effect of exposure to a substance does not directly correlate to the dose received, often observed with toxins and pharmaceuticals.

Threshold Level

The point at which a relatively small change or variation in external conditions can cause a rapid change in an ecosystem or in the properties of a substance.

Technological System

An organized arrangement of people, machines, and procedures designed to perform and control various functions and processes for achieving specific objectives.

Economic Analysis

A study that evaluates the cost-effectiveness of interventions in the economy.