Which substances are secreted at the endings of nerve cells in order to carry a chemical message across the synapse? a) lipids b) neurotransmitters c) antigens d) antibodies

Which statement best describes how the loudness of the sound affects the high-pressure region created by the sound wave? a. a louder sound has no effect on the pressure created. b. a louder sound means a high-pressure region that is higher. c. a louder sound means a high-pressure region that is not as high.