Why Do Na⁺ ions Enter the Cell When Voltage- Gated

question 5

Multiple Choice

Why do Na⁺ ions enter the cell when voltage- gated Na⁺ channels are opened in neurons?

• A) because the Na⁺ concentration is much higher outside the cell than it is inside
• B) because the Na⁺ ions are attracted to the negatively charged interior
• C) because the Na⁺ ions are actively transported by the sodium- potassium pump into the cell
• D) both A and B
• E) both A and C

---

Definitions:

Crop Yields

The total quantity of crop that is harvested per unit of land area.

Bioengineer

A professional who applies principles of biology and the engineering design process to create solutions for health, medical, and environmental challenges.

Biotechnology

The use of living organisms or other biological systems in the production of drugs, agricultural products, and other materials.

Anti-nuclear Movement

A social and political movement opposing the use of nuclear technology, especially nuclear weapons and, sometimes, nuclear power plants, due to safety and environmental concerns.