Open Question
Explain what would happen if depolarization of the trigger zone led to a negative feedback loop instead of a positive one. (Connects to Chapter 1)
11. Nervous Tissue and Nervous System
Action Potentials
Struggling with Anatomy & Physiology?
Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
When an action potential is at its peak, the electrical gradient forces potassium ____________.
A
Out of the cell.
B
Into the cell.
Verified step by step guidance1
Understand the concept of an action potential: An action potential is a rapid rise and subsequent fall in voltage or membrane potential across a cellular membrane, typically observed in neurons.
Recognize the phases of an action potential: It includes depolarization, repolarization, and hyperpolarization. At the peak of depolarization, the inside of the cell is positively charged compared to the outside.
Identify the role of ions during an action potential: Sodium ions (Na⁺) flow into the cell during depolarization, making the inside of the cell more positive. Potassium ions (K⁺) play a crucial role in repolarization.
Consider the electrical gradient at the peak of the action potential: At this point, the inside of the cell is positively charged, creating an electrical gradient that influences ion movement.
Determine the direction of potassium ion movement: Due to the positive charge inside the cell at the peak of the action potential, the electrical gradient drives potassium ions (K⁺) out of the cell to restore the resting membrane potential.
3:53mWatch next
Master Action Potential with a bite sized video explanation from Bruce Bryan
Start learningRelated Videos
Related Practice
Action Potentials practice set
Problem sets built by lead tutorsExpert video explanations