Activation of an odorant receptor (OR) leads to activation of ______ and cAMP production.

The major excitatory neurotransmitter of the CNS is:

A muscle fiber at rest has high extracellular _____ amounts. 

Which kind(s) of muscle utilize gap junctions? (select ALL that apply)

Parkinson’s Disease is characterized by loss of ______ neurons.

Which letter is labeling “repolarization”:

Opening ion channels in a cell membrane will __________.

Serotonin is involved in:

A muscle fiber at rest has high intracellular ______ amounts. 

The ______ phase of a muscle twitch corresponds to removal of Ca2+ from the sarcoplasm.