Communication within a neuron, Three types of neurons work in the spinal cord to create a reflex arc. and Neurotransmitters

Communication within a neuron

Resting potential (Polarization)

Cell at rest

Action potential (Depolarization)

 brief electrical charge that travels down the axon

Threshold

the smallest amount of something needed to cause a reaction that makes a neuron send a message in your brain. If the signal is strong enough, the neuron "fires" and passes the message. If it's too weak, nothing happens

Refractory Period (Repolarization)

cell has to reset

Reuptake

like a cleanup and recycling system in your brain. When neurons send messages using neurotransmitters, they don’t let those chemicals go to waste. Instead, after the message is sent, the neuron takes back some of the extra neurotransmitters to use again later.

Neurotransmitters

Excitatory

make an action potential more likely

Inhibitory

make an action potential less likely

Three types of neurons work in the spinal cord to create a reflex arc.

Sensory/Afferent Neurons (in the PNS)

(Peripheral nervous system) Recieve and carry info 2 the brain

Motor/Efferent Neurons (in the PNS)

Go from the brain 2 the other areas of the body

Interneuron (in the CNS)

Make up the spinal cords and the brain