Uncle mel mentioned having difficulty sleeping. if he was prescribed a medication that targeted serotonin, such as a ssri (selective serotonin reuptake inhibitor), it would also with sleep. there is another chemical secreted in the brain that causes sleepiness. it is characterized as a hormone rather than a neurotransmitter. name this hormone.

The hormone is seretonin.

Explanation:

Seretonin is a hormone that is synthesized from the hydroxylation of amino acid tryptophan resulting in the formation of 5-hydroxytryptophan which further undergo de carboxylation to form seretonin.

 Seretonin is found in both myentric neuron and seretogenic neuron.Seretonin helps to control mood,desire for food and sleep.

  Selective seretonin reuptake inhibitors are used as antidepressent that interfere with the re absorption of seretonin thereby maintaining high level of seretonin in the synapse.

i think it would be b. tissue because an organ system is a group of organs that work together to perform one or more functions. each does a particular job in the body, and is made up of certain tissues.

the correct answer is option b

behavioral response need communication and thus co-ordination at several levels such as interaction among cells, organ system and the entire organism.

behavioral response produces both internal and environmental stimulus.