One Nanogram Does Not Seem Like a Very Large Number

question 95

Multiple Choice

One nanogram does not seem like a very large number. How many magnesium atoms are there in 1.00 ng of magnesium?

• A)4.11 * 10^-11 atoms
• B)2.48 * 10¹³ atoms
• C)6.83 * 10^-35 atoms
• D)6.02 * 10¹⁴ atoms
• E)1.46 * 10³⁴ atoms

---

Definitions:

Action Potentials

Electrical impulses that travel along the membrane of a nerve or muscle fiber, initiating activity or movement.

Coronary Sinus

Short trunk that receives most of the veins of the heart and empties into the right atrium.

Cardiac Veins

Blood vessels that return deoxygenated blood from the myocardium (heart muscle) to the right atrium.

Coronary Vessels

Blood vessels that supply blood to the heart muscle, including coronary arteries and veins.