he was also vividly aware that it was impossible to hide his feelings from ydnas , or to lie to her without her knowing it ; she would be routinely and effortlessly monitoring the tension in every muscle of his face , his eye movements , his pupil dilation , the magnitude of his muscular tremors , the temperature , dampness , and paleness of his skin , his heart rate , his speed of response , his follicular tension , every inflection of his voice , and many other indicators .