LU3: the neural impluse

Question 1

what is a neural impulse

Answer 1

an electro chemical reaction

Question 2

what are ions

Answer 2

fluids containing electrically charged atoms and molecules

Question 3

What are the principal molecules involved in the nerve impulse that flows back and forth across the cell membrane

Answer 3

Positively charged sodium and potassium ions and negatively charged chloride ions.

Question 4

Positive and negative charged ions are inside the cell, between the two, which one has a higher concentration?

Answer 4

Negative charged ions have a slightly higher concentration inside the cell

Question 5

What is the resting state of a neuron

Answer 5

When a neuron is not conducting an impulse

Question 6

How much is the resting potential of a neuron

Answer 6

70 millirotts

Question 7

How is action potential created

Answer 7

When the neuron is stimulated, channels in its cell membrane open, allowing positively charged ions to rush in. For an instant, the neurons charge is positive, creating action potential

Question 8

What is action potential

Answer 8

A very brief shift in the neurons electrical change that travel along the axon

Question 9

What is the absolute refractory period

Answer 9

The minimum length of time needed until another action potential can begin (2 milliseconds)