Nerv06/introduction/mechanism of conductance

POINT!

An action potential, located at one point of neuronal membrane, the adjacent point depolarizes and an action potential is generated.

The neuronal cell body is like a golf ball covered with gunpowder and the neuronal fiber is like fuse connected to that golf ball. When the gunpowder is lit somewhere, the gunpowder in the adjacent point would warm up to

the firing level and the fire would move to that point.

A fire at one point would ignite the adjacent point.

With this principle, the gunpowder on the golf ball would ignite concentrically from the original point

Also, on a fuse, a fire on one point would move along the line.

When point C of a neuronal membrane is stimulated strong enough, action potential is generated and overshoot occurs. When this happens, because of overshoot in point C, the adjacent point D depolarizes. This depolarization is strong enough to reach the firing level (threshold, threshold voltage) and with delay, an action potential is generated. An action potential at one point, strongly depolarizes the adjacent point in the same membrane, and with delay, generates an action potential.

Challenge Quiz

1.

An action potential at one point of a neuronal membrane, hyperpolarizes.depolarizes  正解! the adjacent point of the same membrane.

2.

An action potential at one point of a neuronal membrane, depolarizes the the adjacent point of the same membrane strong enough to reach the firing level (threshold, threshold voltage). true. false  正解!

3.

神経細胞膜のある位置に生じた活動電位は、同じ膜の隣の場所を発火レベル(閾電位、閾値)に達するほど強く脱分極させない。 正.誤  正解!