<prompt> In the presence of a drug that blocks all effects of norepinephrine and epinephrine on the hea, the autonomic nervous system canRaise the hea rate above its intrinsic rateLower the hea rate below its intrinsic rateRaise and lower the hea rate above and below its intrinsic rateNeither Praise nor lower the hea rate from its intrinsic rate  <response>: . 