Answer:
Explanation:
Action potential
It is the potential or power or electrical energy required to generate impulses and provides communication between the neurons is called action potential. Normally cell membrane consists of potential is called resting membrane potential() -70mV. The action potential is due to exchange of different ions across the membrane.
Phases of the action potential in a neuron are
i. Depolarization- it is caused by the influx of sodium and calcium ions through the opening of voltage-gated sodium and calcium channels. sodium ion influx is rapid than the calcium ions membrane potential -70mV to +30mV.
ii. Repolarization - It causes the efflux of potassium ions into the cell through the opening of potassium channels. the membrane returning to resting membrane potential.
iii. After- Hyper polarization - in this stage the potassium channels remain open and causes re polarization and comes to normal membrane potential.
The generation of impulses(depolarization) in neuron mainly depends on influx sodium and calcium ions without these ions, no action potential developed and neuron firing does not occur.
If the drugs inhibit these channels, no depolarization, no action potential, no neuronal firing or communication.
The channels involved in an action potential are voltage-gated sodium channels, potassium channels, and calcium channels.
The action potential is required for transmission of information one are to another area in the body.
The responses to different stimuli is due to action potential.
Answer:
The democracy in Athens has been considered one of the first ones to be established around the world.
Explanation:
The democratic model was based on the indirect democracy in which the representatives weren´t selected to be voted. Instead, the population took place on the executive and legislative powers personally. Participation was universal and economic status was not taken into consideration. This model had a contribution during 400 B.C. by Cleisthenes who is considered to be responsible of the creation of the institutions that take place in this type of democracy.
Answer:
1) risk
2) budget
3) compound interest
4) debt
5) principal
6) credit
Explanation:
I hope these are all right
Presidential government is one of the two kinds of government classified by the relationship between their legislative and executive agencies. The written constitution that provides for the separation of powers between branches is the specific trait gives the United States a presidential system of government.
