Table of Contents
- 1 What term describes the difference in electrical charge across a membrane?
- 2 What is an electrical charge across the cell membrane of a resting neuron?
- 3 When the charge across the membrane of a neuron is about?
- 4 What are the two main phases of an action potential?
- 5 Which is best describes electrochemical forces acting at the resting membrane potential?
- 6 How is the resting membrane potential related to sodium movement?
What term describes the difference in electrical charge across a membrane?
Membrane potential-the difference in electrical charge across a membrane.
What is an electrical charge across the cell membrane of a resting neuron?
A neuron at rest is negatively charged: the inside of a cell is approximately 70 millivolts more negative than the outside (−70 mV, note that this number varies by neuron type and by species).
What is moving depolarization called?
Response. The surge of depolarization traveling from the axon hillock to the axon terminal is known as an action potential. Action potentials reach the axon terminal, where the action potential triggers the release of neurotransmitters from the neuron.
When the charge across the membrane of a neuron is about?
In most neurons this potential, called the membrane potential, is between −60 and −75 millivolts (mV; or thousandths of a volt; the minus sign indicates that the inner surface is negative). When the inside of the plasma membrane has a negative charge compared to the outside, the neuron is said to be polarized.
What are the two main phases of an action potential?
The action potential has three main stages: depolarization, repolarization, and hyperpolarization. Depolarization is caused when positively charged sodium ions rush into a neuron with the opening of voltage-gated sodium channels.
What do you call a change in the membrane potential?
A change in a cell’s membrane potential, such that it becomes more negative, is referred to as a ________. A ________ is a subthreshold change in membrane potential within the cell body that decays as it travels away from its point of origin.
Which is best describes electrochemical forces acting at the resting membrane potential?
A) type of sodium channel activated. B) diameter of the axon. C) type of potassium channel activated. D) permeability of the axonal membrane. Which of the following best describes the electrochemical forces acting on sodium and potassium ions at the resting membrane potential? into the cell. out of the cell.
At the resting membrane potential, the electrochemical gradient for sodium across the membrane is such that the net flux for sodium movement is directed ________, thereby causing the cell’s membrane potential to become more ________. The membrane potential at which there is no net flux of an ion across the membrane is called that ion’s ________.
How does active transport work against an electrochemical gradient?
The electrical and concentration gradients of a membrane tend to drive sodium into and potassium out of the cell, and active transport works against these gradients. To move substances against a concentration or electrochemical gradient, the cell must utilize energy in the form of ATP during active transport.