Question

The critical level to which the membrane potential must be depolarized in order to cause an...

The critical level to which the membrane potential must be depolarized in order to cause an action potential is called the:

A. resting membrane potential

B. receptor (generator) potential

C. excitatory postsynaptic potential

D. electrical refractory period

E. threshold potential

F. end plate potential

Science   Anatomy-And-Physiology   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

Answer:-(e) threshold potential

Explanation:- the minimum potential needed to achieve an action potential is called threshold potential. Action potential occurs only when the membrane is stimulated (depolarized) enough so that sodium channel get opened completely and more of sodium enters the membrane. This makes the membrane potential more negative. When the membrane potential reaches the threshold potential ( generally 5-15 mV less negative than resting potential) , all voltage gated sodium channel get opened. Sodium ions rapidly diffuse inwards and depolarization occurs.

0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
An inhibitory neurotransmitter may cause the movement of which ion across the membrane? a) Na+ b)...
An inhibitory neurotransmitter may cause the movement of which ion across the membrane? a) Na+ b) Mg2+ c) K+ d) Ca2+ Excitatory neurotransmitters produce which types of electrical responses in the postsynaptic neuron? a)Hyperpolarizations b)EPSPs c)IPSPs d)Threshold level inhibitions Neurotransmitters induce membrane potential changes: a) by opening voltage-gated Na+ channels on the postsynaptic axon hillock. b) on the presynaptic cell body. c) by opening mechanically-gated Mg2+ channels on the postsynaptic axon. d) on the postsynaptic dendrites and cell body
. How do graded changes in membrane potential give rise to all-or-none changes that generate action...
. How do graded changes in membrane potential give rise to all-or-none changes that generate action potentials? a) The membrane recognizes only action potentials generated by positive ions, causing a voltage threshold to be reached. b) The membrane recognizes only action potentials generated by negative ions, causing a voltage threshold to be reached. c) Many graded potentials at different points along the membrane are summed, causing the voltage threshold to be reached. d) Many graded potentials reaching the same point...
1. At resting membrane potential in a neuron, which is true of the forces responsible for...
1. At resting membrane potential in a neuron, which is true of the forces responsible for the movement of potassium (directed into or out of the cell)? Select one: a. The chemical gradient is outward while the electrical gradient is inward b. Chemical gradient is inward while the electrical gradient is outward c. Chemical and electrical gradients are directed outward d. Chemical and electrical gradients are directed inward 2. Multiple sclerosis is a devastating disease because it... Select one: a....
17. Which of the following statements are accurate? A. Neurotransmitters can act as ligands. B. Acetylcholine...
17. Which of the following statements are accurate? A. Neurotransmitters can act as ligands. B. Acetylcholine is a neurotransmitter. It can bind to an acetylcholine receptor on the surface of a cell. If this receptor is also a sodium channel, we would call acetylcholine a ligand and its receptor a ligand-gated receptor. C. Neurotransmitters can act as chemical signals between two neurons. D. Diffusion is a type of passive transport and does not require energy. Sodium channels are an example...
1.) The primary motor cortex: a.)is a gyrus of the brain located behind the central fissure...
1.) The primary motor cortex: a.)is a gyrus of the brain located behind the central fissure or groove b.) is a gyrus of the brain located in front of the central fissure or groove c.) is an area in the temporal lobe of the brain d.) is an area located in the occipital area of the brain Temporal summation is where: a) several synapses generate many excitatory potentials that add up to threshold,              causing an action potential to occur...
Please No Explanation just ANSWER A,b,c,etc! QUESTION 24 Fifty neurons release excitatory neurotransmitters onto the dendrites...
Please No Explanation just ANSWER A,b,c,etc! QUESTION 24 Fifty neurons release excitatory neurotransmitters onto the dendrites and body of neuron “A.” Neuron A reaches threshold and fires an action potential. This is an example of saltatory summation. continuous summation. spatial summation. temporal summation. Which of the following terms does not belong with the others? sodium IPSP excitatory depolarize 2 points    QUESTION 27 Which one of the following terms does not belong with the others? graded potential depolarizing phase action...
best definition of action potential? A: a wave of electrical excitation that travels without signal weakening...
best definition of action potential? A: a wave of electrical excitation that travels without signal weakening B: passive spread of an electrical signal C: signal that travels only extremely short distances, from one ion channel to the next best definition of the resting membrane potential? A: steady-state condition in which there is no net change in electrical potential difference across a membrane B: membrane potential when a person is laying down, always lower because of changes in blood pressure C:...
1. The release of the neurotransmitters cause cations to flow across the target cell membrane leading...
1. The release of the neurotransmitters cause cations to flow across the target cell membrane leading to membrane depolarization [an action potential]. What type of receptor is most likely responsible for this effect? a. Protein kinase receptors. b. Ligand-gated channels. c. G protein coupled receptors. d. Ion channels. e. Intracellular receptors. 2. Which type of cellular receptor autophosphorylates itself when it interacts with its signal? a. Protein kinase receptors. b. Ligand-gated channels. c. G protein coupled receptors. d. Intracellular receptors....
The soma sensory neurons are located in which of the following structures? Dorsal column Ventral root...
The soma sensory neurons are located in which of the following structures? Dorsal column Ventral root Dorsal root ganglion Gray matter Bill has lost feeling in his left foot. Briefly describe 3 possible locations of injury that could result in this symptom and explain how each injury results in this symptom. Briefly describe a major difference between the spatial-temporal summation of presynaptic inputs onto a postsynaptic neuron. As the strength of the stimulus increases, the amplitude of action potentials generated...
Q1. In order for a neuron to move from the absolute to the relative refractory period,...
Q1. In order for a neuron to move from the absolute to the relative refractory period, a majority of that neuron's sodium channels must have their: Select one: a) inactivation gates open b) activation gates closed c) inactivation gates closed d) activation gates open and inactivation gates closed Q2. Which of the following is NOT true of graded potentials? Select one: a) They are produced after the binding of neurotransmitter to receptor b) they will decrease in magnitude as the...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT