Barium Is a Nonessential Element in the Human Body, but Some

question 26

Multiple Choice

Barium is a nonessential element in the human body, but some organisms build exoskeletons using barium sulfate, which has a K_sp of 1.1  10^10 at 25C. What is the mass of barium in 1.0 L of a saturated solution of barium sulfate at 25C?

• A)4.1  g
• B)1.4 mg
• C)3.7 mg
• D)7.3  g
• E)15 ng

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Definitions:

Myelin

The fatty substance that coats the axons, which speeds the transmission of electrical impulses and neurological function.

Age-related Hearing

The natural decline in auditory function associated with aging, leading to conditions such as presbycusis.

Neural Impulses

Electrical signals that travel along neurons, facilitating communication within the nervous system.

Auditory Cortex

The part of the brain that is responsible for processing auditory information, located in the temporal lobe.