Neurons
The part of the neuron that receives incoming signals.
Dendrites
The brain and spinal cord make up this part of the nervous system.
Central nervous system
These chemical messengers travel through the bloodstream.
Hormones
The electrical signal that travels down a neuron.
Action potential
The space between two communicating neurons.
Synapse
The long part of a neuron that carries impulses away from the cell body.
Axon
This part of the nervous system controls voluntary movements
Somatic nervous system
This "master gland" controls many other glands in the endocrine system.
Pituitary gland
The brief time after a neuron fires when it can’t fire again.
Refractory period
These chemical messengers carry messages across the synapse.
Neurotransmitters
This type of neuron carries messages from the body to the brain.
Sensory neurons
The "fight or flight" response is triggered by this system.
Sympathetic nervous system
This gland regulates metabolism.
Thyroid gland
This law states that a neuron either fires completely or not at all.
all-or-none principle
The part of the neuron that releases neurotransmitters.
Axon terminal
The insulating layer that speeds up signals in a neuron.
Myelin sheath
This system calms the body after stress, restoring balance.
Parasympathetic nervous system
This gland produces insulin to regulate blood sugar.
Pancreas
The brain sends signals by using these special cells.
Neurons
This effect decreases the chance that a neuron will fire, making it less likely to send a signal.
Inhibitory effect
The gap between the axon of one neuron and the dendrite of another.
Synapse
Nerves outside the brain and spinal cord are part of this system.
Peripheral nervous system
These glands, located on top of the kidneys, produce adrenaline.
Adrenal glands
When a neuron is not sending an impulse, it is at this state.
Resting potential
This effect increases the chance that a neuron will fire an action potential.
Excitatory effect