The difference in charge across the membrane is called the



.

It is measured in



At resting potential, the charge of the outside of the neuron is

and

the inside is

.

Once a stimulus changes the membrane potential, the neuron conducts an impulse called a(n)

.

This causes the charge outside the cell to temporarily become

and

the inside to temporarily become

.

When the action potential arrives at the axon terminal it reaches a junction called the

Because the nerve impulse cannot cross the synaptic cleft,

are released.

The difference in charge across the membrane is called the membrane potential. It is measured in Milivolts.

At resting potential, the charge of the outside of the neuron is positive and the inside is negative. Once a stimulus changes the membrane potential, the neuron conducts an impulse called a(n) action potential.

This causes the charge outside the cell to temporarily become negative and the inside to temporarily become positive.

When the action potential arrives at the axon terminal it reaches a junction called the synaptic cleft.

Because the nerve impulse cannot cross the synaptic cleft, neurotransmitters are released.

Explanation:

The cell has a membrane that acts as a barrier between the outside and the inside of the cell, allowing the passage of some ions and retaining others. By doing this, there is a difference in charges between the inside and outside that is called the membrane potential, thanks to this difference in charge that the membrane creates the cell can communicate with other cells generating an action potential, which is a modification in the cell charge due to the flow of positive ions to the inside and the exit of negative ions to the outside. This is a temporary modification that ends when the action potential arrives at the presynaptic terminal releasing the neurotransmitters to the synaptic cleft, then the neurotransmitters will interact with the postsynaptic terminal receptors of a different neuron to open their ion channels and generate a new action potential.

estuaries are the partially enclosed coastal bodies of brackish water formed at the mouth of sea where river meets an ocean. it is a transition zone between river and sea water so estuaries are influenced to both marine environment such as tides, waves and to riverine such as flow of fresh water and sediments. the mixing of sea and fresh water provide high level of nutrients, making estuaries a high product habitats.

many estuaries suffers degradation from a variety of human activities like erosion from deforestation, overgrazing, overfishing, drainage and eutrophication.

so from the above statement answers will be

1. false as estuaries are formed due to both brackish and freshwater.

2.true, due to high productivity estuaries are breeding ground for many marine species.

3. direct and indirect activities of man that contribute to pollution and deposition of sediments.