releasing "signal" molecules into the blood. Blood-borne emotion-related signals activate specific receptor proteins on the surfaces of cells in tissues and organs. Activated receptors serve as molecular switches that adjust the metabolic system and behavior of the organism, so as to accommodate environmental challenges. Physiologic responses to environmental signals include regulations of the nervous system, endocrine organs, and the cardiovascular, respiratory, digestive and excretory functions. During pregnancy, the parent's perception of the environment is chemically communicated to the fetus through the placenta, the cellular barrier between the maternal and fetal blood. The mother's blood-borne emotional chemicals cross the placenta and effect the same target cells in the fetus as those in the parent. Though the developing child is "unaware" of the details (i.e., the stories) evoking the mother's emotional response, they are aware of the emotion's
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