A Certain Substance Makes Up 4

question 40

Multiple Choice

A certain substance makes up 4.8 × 10^-4 percent by mass of a normal healthy human being.How many grams of that substance would be found in the body of a person weighing 120 lb? (1.0 kg = 2.2 lb)

• A)2.6 g
• B)0.26 g
• C)580 g
• D)260 g
• E)1.3 g

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Definitions:

Cerebrum

The largest part of the brain, responsible for higher brain functions such as thought and action.

Fibers

Threadlike structures forming animal or vegetable tissue; in technology, often refers to materials used in making textiles or composites.

Auditory Cortex

The region of the brain that processes auditory information, allowing for the perception of sounds.

Temporal Lobes

Lobes at the sides of the brain’s cerebral cortex; they contain areas involved in hearing, memory, perception, emotion, and (in the left lobe, typically) language comprehension.