which of the following would not result in the dilation of the feeder areterioles and opening of the precapillary sphincters in systemic capillary beds?A) a decrease in stimulation of vasomotor fibersB) a local increase in tissue oxygen contentC) an increase in local tissue carbon dioxideD) a decrease in local tissue oxygen contentThe short-term controls of blood pressure, mediated by the nervous system and bloodborne chemicals, primarily operate via all but which of the following?a) centers in the medulla obloganta and the ponsb) reflex arcs involving baroreceptorsc) reflex arcs associated with vasomotor fiberswhich of the following chemical substances does not help regulate blood pressure?a) oxytocinb) atrial natriuretic peptidec) angiotensin IId) antidiuretic hormone (ADH)