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
Bad White [126]
3 years ago
8

Once a neuron is stimulated and the membrane potential is depolarized, the depolarized axonal membrane is helped to return to it

s resting potential by opening voltage-gated K+ channels, allowing K+ to flow out of the cell down its concentration gradient.
(a) True
(b) False
Biology
2 answers:
levacccp [35]3 years ago
8 0

Answer:

False.

Explanation:

Neuron or nerve cell may be defined as the structural and functional unit of the nervous system. The neurons conduct the nerve impulse and helps in the transmission of signals.

The depolarization of the cell occurs due to the influx of sodium ions into the cell. For the cell membrane to be in resting potential, the potassium ions moves inside the cell from outside the environment and not out of the cell of the organism.

Thus, the correct answer is option (b).

Vadim26 [7]3 years ago
4 0

Answer:

Explanation:

The cell membrane separates the cell from the outer environment. The extracellular fluid contains the sodium ions (Na+), chloride ions (Cl-), while intracellular fluid contains potassium (K +) and negative anions.

The potential difference arises when the membrane is selectively permeable to some ions. The resting potential is -70mV.  

When the neurons get excited, the sodium ions start to enter by sodium channels.  

Now there are more positive ions inside the cell membrane. It disturbs the resting potential i.e. -70mV. This stage is known as depolarization.

When the inside environment of the cell is more positively charged, the potassium ions start to move out of the cell. It goes out by the voltage-gated channels. Thus resting stage is maintained and it is known as repolarization.

But the initial stability of the cell membrane has to be maintained. To restore the resting stage, the sodium ions start to move out of the membrane and potassium ions enter into the cells again. This is an active transport and has done by the Na+ - K+ pump. Here 3 sodium ions move out and 2  potassium ions pumped into the cell through the plasma membrane.  

Thus the resting potential regains. The potassium ions come back into the cells against the concentration gradient and ATP provides the energy for this phenomena.

You might be interested in
Which plate boundaries and movements most commonly create earthquakes? Explain how earthquakes can be created by plate tectonics
ser-zykov [4K]
1. Divergent Plate Boundaries or Constructive Plate Boundaries. This is where two plates separate. Ridges are created when mantle convection rises up beneath it, with extreme heat, the crust will thin, and the igneous material beneath will eventually. 

<span>2. Divergent, or destructive plate margins cause volcanoes. As the more dense plate subducts, it will melt at depth and the water driven off, will lower the melting point of the overlying mantle wedge, this will create a type of magma. Volcanic Island Arcs are formed at oceanic-oceanic destructive plate margins. The hot, bouyant magma, is less dense that the surrounding rock, so will rise to the surface, and will collect beneath the plate that hasn't been subducted. It will then, under increased pressure erupt under the sea. Over thousands to millions of years, it will keep erupting, to form islands. </span>

<span>3. Earthquakes are mainly caused at Transform boundaries and Divergent boundaries. At transform boundaries, two plates sliding past eachother, and the build up of friction could lead to earthquakes, if enough stress is built up and then suddenly released, then the energy is released as seismic waves or an earthquake. At divergent boundaries, earthquakes happen along the Benioff zone which is the slope of the subducting plate that is slowly being dragged into the mantle by mantle convection and slab pull. </span>

<span>4. Divergent boundaries cause orogenisis (mountain building). But only the continental-continental margin where two continental plates are colliding. Because they are the same density, they don't subduct, but they buckle, compress and uplift to form mountains. Just like the himilayas, when the Indian plate collided with the eurasian plate.</span>
6 0
3 years ago
All the rabbits living in a particular area would be an example of
Crank

Answer:

population

Explanation:

3 0
2 years ago
The end products of photosynthesis include
Arlecino [84]

Answer:

Food for the plant and the ground soil around the plant will get nutrients.

Explanation:

7 0
3 years ago
Your friend's little brother ate raw cookie dough made with eggs. The next day he had diarrhea, abdominal cramps, and fever. He
user100 [1]

Answer:

d

Explanation:

7 0
3 years ago
Read 2 more answers
There is a trait with two alleles. one allele codes for blue while the other allele codes for yellow. if this trait is inherited
Natasha2012 [34]
The answer is: blue and yellow striped.
4 0
4 years ago
Other questions:
  • Evolution that occurs over a long period of time is called
    10·1 answer
  • An important response mechanism in our bodies is blood clotting. The response loop is initiated when injured tissue releases sig
    5·1 answer
  • Which one is it? please help
    6·1 answer
  • What factor helps determine the fertility rate of a group of people?
    7·2 answers
  • The external auditory canal ends at the
    14·1 answer
  • Which phrase describes one characteristic of radioactive elements
    7·2 answers
  • Rock that is cooled and solidified above ground is called:
    14·1 answer
  • Are unicellular organisms able to live in any environment?
    15·1 answer
  • Because plant cells have chloroplasts and can do photosynthesis, why do they also need mitochondria?
    10·1 answer
  • For blood to be separated into its primary visible components of plasma and red blood cells, it must be spun around in a machine
    13·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!