The ______ phase of a muscle twitch corresponds to excitation-contraction coupling. 

In a fused tetanus, intracellular levels of ____ increase as this ion accumulates in muscle fibers. 

Which part of the neuron receives incoming information (input):

A selective serotonin reuptake inhibitor (SSRI) is will ____________.

Which part of a neuron generates and conducts electrical output (sending information to ‘downstream’ cell):

Which is smallest:

_________ is the term that means to go from resting membrane potential down to a more negative membrane potential. 

Which term designates the cell plasma membrane in muscle:

Opening of a ligand-gated K+ channel occurs in _________.

Motivation and reward (or reinforcement) is mediated primarily by ___________ in the CNS and is the target of drugs of abuse such as heroin.