Doreen Pang Mrs. Trainor AP Psychology 5 October 2016 Module 4-1: Neural and Hormonal Systems Neural Communication Body?s info sys. is built from billions of neurons Systems are composed of smaller subsystems Biophysical systems Smaller system in med sys. in large sys. Biological psychologists Branch of psychology concerned with the links btwn biology and behvaior. gaining better understanding of: Sleep and dreams depression and schizophrenia hunger and sex stress and disease Neurons Neurons building blocks of the nervous system Dendrite fibers on a neuron that receive info and conduct it toward the cell body Axon fibers that pass the message along to other neurons Dendrites speaks, Axons listen Motor neurons controls muscles neural system?s giant redwoods Myelin Sheath