Many neurotransmitters are too large to cross the blood-brain barrier, so smaller molecules must be sought to alter brain biochemistry. To effect changes in brain activity in subjects with mood disorders due to deficits in serotonin, a strategy designed to increase the effective concentration of serotonin at serotonergic synapses must be used, including :

In which of the following ways is the function of the surface of a microsphere similar to the function of an actual cell membrane? a.both make it possible for the conditions in the interior to be different from the conditions outside. b.both provide a barrier that keeps water from flowing across it so the interior remains dry. c.both separate the rna that forms in the interior from any rna that might form in the environment. d.both can actively move molecules into the interior or out into the surrounding environment.

The body is protected against harmful flu viruses by

Which type of respiration takes place when there is no oxygen present