1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
WITCHER [35]
3 years ago
6

Action potentials (nerve impulses) are changes in the membrane potential that, once started, will affect the entire excitable me

mbrane. The first action potential is usually generated at the initial segment of the neuron's axon. This activity will test your understanding of the sequence of events that occur at the membrane of the initial segment of the axon during generation of an action potential.
a..Threshold stimulus
Na+ channels open

b..Na+ influx
Depolarization

c.Na+ channels close

d..K+ efflux
Repolarization

e.Hyperpolarization
K+ channels close
Biology
1 answer:
garri49 [273]3 years ago
7 0
<h2>Action potential </h2>

Explanation:

Brief sequential change in the membrane potential of excitable cells after stimulus is called action potential

Phases of action potential includes:

  • Depolarization: Starts when a threshold stimulus applied on a neuron via Na+ mechanically operated channels that trigger action potential
  • Depolarization of membrane potential is due to influx of Na+ via voltage gated Na+ channels
  • Fast opening of voltage gated Na+ channels shift membrane potential from -70mV to +50mV at which voltage gated Na+ channels becomes inactive, thus influx of Na+ abruptly stops
  • Repolarization: Starts with the efflux of K+ by the opening of voltage gated K+ channels
  • Voltage gated K+ channels starts to open when voltage gated Na+ channels becomes inactive
  • Hyperpolarization: Occurs due to excessive efflux of K+ by voltage gated K+ channels
  • Additional efflux of K+ occurs due to slow inactivation of voltage gated K+ channels
  • In a typical neuron cell, membrane potential of cytoplasm is negative (-70mV) at rest hence called resting membrane potential
  • Resting membrane potential of excitable cells is established by Na+ K+ pump and maintained by K+ leaky channels at rest

You might be interested in
What is an observation
vagabundo [1.1K]
Hello!

Could be either:

<span>The action or process of observing something or someone carefully or in order to gain information.
</span>
Or 

<span>A remark, statement, or comment based on something one has seen, heard, or noticed.
</span>
And in Science:

 <span>An 'observation' in the scientific sense, is when you make a measurement or evaluation of some sort. You would usually make a note of how something has changed sine the previous ovbservation. Maybe the temperature has changed: gone up one degree; or a crystal has grown: maybe it is now .1 centimeters longer. 

"Observations" usually implies that you are watching some process, and either measuring or noting the change that has taken place. usually you will also want to note the time of the observation, so that you can have an idea of how quickly (or slowly) the changes are occurring.
</span>

Hope this All Helps (Hope it did)! Have A Wonderful Day! :)
4 0
3 years ago
Why is the age of a fault younger than the rock in which it is found?
Anna [14]
Inclusions are always older than the rock they are found in.
5 0
3 years ago
Which statement describes the motion of the water molecules in this situation? The water molecules move by active transport into
Neporo4naja [7]

The water molecules move by osmosis into the cell from high water concentration to low water concentration.

5 0
3 years ago
Read 2 more answers
Disaccharides include what sugar molecules. True or False?
AURORKA [14]
If this answers your question:
Disaccharides are formed when 2 sugar molecules combine. An example of this is Maltose
8 0
3 years ago
What charactorizes an iconic bond
Mekhanik [1.2K]

Chemical bonds formed when atoms gain/lose electrons, and oppositely charged ions attract. Ion. A particle having an electrical charge. Electronegativity difference between 0 and 0.3. Characterizes onpolar covalent bond.

8 0
3 years ago
Other questions:
  • The _____ _______, which is in the units mg/100 mL plasma, is the maximum concentration of a substrate that the kidneys can reab
    9·1 answer
  • What are some of the basic characteristics that scientists consider when classifying living things?
    15·1 answer
  • Is a crashed object from space that leaves a "dent".
    11·2 answers
  • In any population there will be variations of certain characteristics. For example, in the giraffe population there is a variati
    5·2 answers
  • How do the daughter cells produced by mitosis compare to the original cell?
    10·2 answers
  • Where does the humoral response happens
    11·1 answer
  • What might happen to a cell if it was missing some chromosomes?
    13·1 answer
  • What are the characteristics of annelidas
    7·1 answer
  • Are RNAs processed before translation is able to occur in Prokaryotes? Do only mRNAs undergo processing and maturation in Eukary
    12·1 answer
  • .What is the average population size of gray foxes from Year 1 to Year 5?​
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!