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antoniya [11.8K]
3 years ago
11

An action potential is regarded as an example of a positive feedback. Which of the following examples below best illustrates the

positive feedback aspect of an action potential?
Potassium permeability is about 25 times greater than sodium ions.

Voltage gated potassium ion channels open slowly and remain open long enough to cause hyperpolarization.

The sodium potassium pump consistently moves ions as long as ATP is available, and regardless of membrane potential changes.

A threshold stimulus will cause the opening of voltage gated sodium ion channels that will cause further depolarizing stimulus.

This stimulus will open still more voltage gated sodium ion channels.
Chemistry
1 answer:
saul85 [17]3 years ago
4 0

Answer:

A threshold stimulus will cause the opening of voltage gated sodium ion channels that will cause further depolarizing stimulus.This stimulus will open still more voltage gated sodium ion channels.

Explanation:

Action potential: It occurs when the potential of a membrane, of a specific cell location rapidly falls and raises. This depolarization stimuli later cause adjacent location to similarly depolarize. It is produce by the special types of voltage gated ion channels present in the cell's plasma membrane.

These channels are closed when the membrane potential near resting potential of the cell which is also called negative potential, but they fastly starts to open if the membrane potential increase to a defined threshold voltage, and depolarizing the potential of transmembrane.

When the channels are open, they allow sodium ions inward flow, which cause the changes in electrochemical gradient and producing further raise in the membrane potential. This then cause more channels to open.

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Please help! 50 points and Brainliest!
olga2289 [7]

Answer:

exothermic reaction

Explanation:  

I think this because this is an example of an exothermic reaction is the chemical reaction between sodium and chlorine, which results in the formation of sodium chloride (also known as common salt)

8 0
2 years ago
Read 2 more answers
Answer pls..... how????
Irina-Kira [14]

Answer:

E

C

B

D

A

Explanation:

The definition of words correspond well with the answers I provided and somewhat match with the dictionary definitions.

3 0
3 years ago
Which of the following summertime activities consists solely of physical change?
Evgen [1.6K]
A: making s sandcastle. This is because water and sand is only a mixture, so they do not react with each other. All the rest include chemical reactions!
5 0
3 years ago
If the half life of iridium-182 is 15 years, how much of a 3 gram sample is left after 2 half-lives?
padilas [110]

Answer:

D. 0.75 grams

Explanation:

The data given on the iridium 182 are;

The half life of the iridium 182, t_{(1/2)} = 15 years

The mass of the sample of iridium, N₀ = 3 grams

The amount left, N(t) after two half lives is given as follows;

N(t) = N_0 \left (\dfrac{1}{2} \right )^{\dfrac{t}{t_{1/2}} }

For two half lives, t = 2 × t_{(1/2)}

∴ t = 2 × 15 = 30

\dfrac{t}{t_{(1/2)}} = \dfrac{30}{15} = 2

\therefore N(t) = 3 \times\left (\dfrac{1}{2} \right )^2 = 0.75

∴ The amount left, N(t) = 0.75 grams

4 0
3 years ago
One of these notations represents the definition of one mole. That is
just olya [345]

Answer:

6.02*10^23

Explanation:

This is the number for one mole. Just like one dozen = 12, one mole = 6.02*10^23.

Fun fact, if you had a mole of pennies you could spend 1 million dollars every second of your life and not have even spent 1% of it by the time you die at 100 years old.

3 0
3 years ago
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