Biology: The Unity and Diversity of Life (14th Edition)

Published by Brooks/Cole Publishing Co.
ISBN 10: 1305073959
ISBN 13: 978-1-30507-395-1

Chapter 32 - Self-Quiz - Page 559: 4



Work Step by Step

All action potentials are of the same magnitude. Each action potential peaks at +30 mV; the action potential cannot get any higher because once it reaches a particular voltage, the voltage-gated sodium channels close and the voltage-gated potassium channels open, allowing potassium ions to travel out of the cell down its concentration gradient. This causes a reduction in the membrane potential. Because the positive potassium ions move out of the cell, the membrane potential decreases to a little below the resting potential. Potassium ions quickly diffuse from the cytoplasm, and the amount of potassium ions are returned to normal conditions, thus restoring the resting potential.
Update this answer!

You can help us out by revising, improving and updating this answer.

Update this answer

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.