Which statement about sensory systems is not true? a. Sensory transduction involves the conversion (direct or indirect) of a physical or chemical stimulus into changes in membrane potentials. b. In general, a stimulus causes a change in the flow of ions across the plasma membrane of a sensory receptor cell. c. The term “adaptation” refers to the process by which a sensory system becomes insensitive to a continuing source of stimulation. d. The more intense a stimulus, the greater the magnitude of each action potential fired by a sensory neuron. e. Sensory adaptation plays a role in the ability of organisms to discriminate between important and unimportant information.