A Drug Would Prevent an Action Potential If It

question 30

Multiple Choice

A drug would prevent an action potential if it:

• A) lowers the threshold of the membrane.
• B) blocks the movement of potassium across the membrane.
• C) blocks the movement of sodium across the membrane.
• D) increases the movement of sodium across the membrane.

---

Definitions:

Lithosphere

The rigid outer layer of the earth, including the crust and upper mantle, which is divided into tectonic plates.

Biosphere

The global sum of all ecosystems, including all living organisms and their relationships to each other and to their environments.

Groundwater

Water that occurs in the pores, fractures, and cavities in the subsurface.

Ocean Currents

Systems of surface and subsurface currents that circulate throughout the ocean, driven by factors such as wind, temperature, salinity, and the Earth's rotation.