According to the "all-or-none" law, action potentials that are generated by the same neuron are constant in __________ and __________.

A __________ is a chemical secreted by a gland or other cells into the blood, whereas __________ are responsible for producing hormones.

Most neurons are kept inside __________ at the __________ terminals.

A __________ has its soma in the spinal cord, receives excitation from other neurons, and conducts impulses along its axon to a muscle.

__________ raise neurons' firing rate above the spontaneous firing rate, whereas __________ suppress their firing rate below the spontaneous firing rate.

Santiago Ramón y Cajal demonstrated that __________ do not grow into each other, and the __________ is not one continuous thing.

Neurons consist of __________.

Action potentials travel down the axon to the presynaptic terminal, which trigger __________: the release of neurotransmitters in bursts from the presynaptic terminal

into the synaptic cleft.

__________ is the process whereby neurotransmitters are recycled to the presynaptic neuron.

A __________ is specialized at one end and highly sensitive to a particular type of stimulation, such as touch, light, sound, and so on.

__________ refers to short unmyelinated sections that speed up propagation of action potentials along the axon via saltatory conduction.

In each pump cycle, a Na+/K+ pump brings __________ and __________.

__________ is the sporadic production of action potentials in a neuron without actual stimulation.

__________ is a major neurotransmitter inside the human body.

Monoamine oxidase is an enzyme that breaks down excess levels of __________.

__________ is the stage whereby the membrane potential goes all the way down towards negative, until it undershoots its resting potential.

During __________, the Na+ channels become inactive and neurons cannot generate other action potentials.

If a neuron has been __________ and __________, the same stimulus will not be strong enough to bring the membrane potential past the threshold.

No __________ can be generated or propagated along __________.