Nerve impulse

The threshold potential of the neruon membrane is.....which requires a change of...mV from the resting membrane potienal of...mV to generate an action potienal.

-55mV 15mV and -70mV

If the membrane potienal falls below the resting membrane potienal, called....it is restored back to normal by the.....leak channels and the...pump

Hyperpolarization, potassium, Na+_K+

After an action potienal the neuron cannot generate another action potienal because...channels are inactivated. This period is called the....period. This also insures that the action potienal always flows away from the....on the...., and not back up the axon

Na+,refactory, axon hillock, axon terminal

When the action potential reaches the axon terminal, it causes the release of

Neurotransmitters

The dendrites receive signals from messenger molecules released from adjacent neurons called

Presynaptic

This depolarization of the membrane causes....gated....channles in the membrane further down to open which causes it to depolarize. This sequential depolarization allows the action potienal to flow like a....down the axon all the way to the....

Voltage, Na+, current, axon terminal

These molecules bind to receptors that acts as....-gates channels. When these channels open they allow ions to flow in or out which produces small changes in the membrane around the receptors, known as..... these changes can be positive.... or negative....

Voltage, stimuli, excitatory, and inhibitorary

When enough neurotransmitters is released onto the dendrites to reach the threshold potential....-gated....channels in the....are opened allowing.... ions to move.....the cell, causing the membrane to become more....inside which results in a/an.....membrane potential.

Voltage,Na+,membrane, Na+,into, positive, positive