Biological explanation of depression

• What are neurotransmitters?


  Transmit messages chemically across synapses.
• How does serotonin affect depression?

  Low levels at synapse —> less stimulation of post-synaptic neuron —> causes low mood.
• What other effects can low levels of serotonin have?

  Lack of concentration, disturbed sleep, reduced appetite.
• What are reasons for low serotonin levels?


  Genes can cause inheritance of low serotonin production.

  Low levels of tryptophan (ingredient of serotonin) from lack of protein or carbs.