The Average Concentration of Calcium in the Human Body Is

question 2

Multiple Choice

The average concentration of calcium in the human body is 15 mg/g of body mass. What is the mass of calcium in the body of a person weighing 150 lb? (1 lb  454 g)

• A)1.0 lb
• B)0.023 lb
• C)23 lb
• D)100 lb
• E)2.3 lb

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Definitions:

Signals

Means of communication or interaction between cells, organisms, or molecules that trigger responses.

Cyclic AMP

A secondary messenger important in many biological processes, formed from ATP by the action of adenylyl cyclase.

Second Messenger

A substance (e.g., cyclic AMP or calcium ions) that relays a message from a signaling molecule (the first messenger) bound to a cell-surface receptor; leads to some change in the cell.

Protein Kinase A

An enzyme that transfers phosphate groups from ATP to specific proteins, playing a key role in the regulation of cellular processes.