Water Accounts for Approximately Two-Thirds of the Mass of the Adult

question 157

Multiple Choice

Water accounts for approximately two-thirds of the mass of the adult human body.If an adult human has a mass of 145 pounds,how many water molecules are there in the adult human's body?

• A)96.7 molecules
• B)2)43 × 10³ molecules
• C)1)47 × 10²⁷ molecules
• D)2)20 × 10²⁷ molecules

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Definitions:

Depolarization

The loss of polarity, or opposite charges inside and outside; the electrical impulse that initiates a chain reaction resulting in contraction.

Electrical Impulse

A rapid, transient electrical charge that travels along the membrane of a nerve or muscle cell.

Chain Reaction

A sequence of reactions where a reactive product or by-product causes additional reactions to take place.

P-R Interval

A measurement on an electrocardiogram (ECG) reflecting the time between the onset of atrial depolarization and the onset of ventricular depolarization; important in diagnosing cardiac conditions.