Anyone have any ideas for the google science fair?

What part of the brain is highlighted in the diagram below?

Which part of the neuron below is indicated by the arrow, and what is its function? hormones send chemical signals throughout the body to regulate other body processes. hormones are chemical signals that are sent throughout the body to regulate other body processes. hormones send electrical signals throughout the body to regulate other body processes. hormones are electrical signals that are sent throughout the body to regulate other body processes.

2polnis which of the following is an advantage of an in vitro experiment?me