Multiple Choice
Which of the following neurotransmitter types blocks Cl- channels and makes depolarization harder?
9. Transport Across Membranes
Ion Channels and Neurons
Struggling with Cell Biology?
Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
The opening of which type of channel causes depolarization of the neuron?
A
Voltage gated K+ channels
B
Voltage gated Na2+ channels
C
Voltage gated Ca2+ channels
D
K+ leak channels
Verified step by step guidance1
Understand the concept of depolarization: Depolarization is a change in a cell's membrane potential, making it more positive. This is a crucial step in the process of generating an action potential in neurons.
Identify the role of ion channels in depolarization: Ion channels are proteins that allow specific ions to pass through the cell membrane. The movement of ions across the membrane can change the membrane potential.
Focus on sodium (Na+) channels: Voltage-gated Na+ channels open in response to a change in membrane potential. When these channels open, Na+ ions rush into the neuron due to the concentration gradient and electrical gradient.
Relate Na+ influx to depolarization: The influx of Na+ ions into the neuron makes the inside of the cell more positive, leading to depolarization. This is a key step in the initiation of an action potential.
Differentiate from other channels: Voltage-gated K+ channels and K+ leak channels typically contribute to repolarization or maintaining resting potential, while voltage-gated Ca2+ channels are more involved in neurotransmitter release rather than depolarization.
Related Videos
Related Practice
Ion Channels and Neurons practice set
Problem sets built by lead tutorsExpert video explanations