Responding to a Stimulus

signals

they carry information that tells us to listen, relax, stop, or be alert

nerve impulses

is a wave of chemical and electrical signals that are conducted along the neuron

synapse

there is a tiny gap called _____ between two adjacent neurons and between neurons and effectors

neurotransmitters

When an impulse reaches the end of the axon, sending information across the synapse in the form of chemical messengers called ________, which are stored in small sacs

reflex

One of the simplest responses of the nervous system is called a _____. It is an automatic response to a change in the environment