The direct manifestation of metabolic acidosis due to insulin deficiency is an increased heart rate, as the body attempts to compensate for the acid-base imbalance. Increased respiratory rate, not decreased, is also a response to acidosis.
One manifestation resulting from metabolic acidosis, a condition that can arise due to insulin deficiency, is increased heart rate. This occurs as the body attempts to compensate for the acid-base imbalance by increasing cardiac output to circulate more blood and as a result, more oxygen to the tissues. The body also responds with increased respiratory rate (not decreased), as it tries to expel more carbon dioxide (acidic in solution) to alleviate the acidosis. Therefore, the answer to the question is Increased heart rate. High organ demand due to metabolic acidosis can paradoxically lead to decreased urine output because of the body's attempt to preserve fluid, which could exacerbate the acidosis if not corrected. It's important to note that while increased blood pressure can sometimes occur in response to stress and fluid shifts, it is not a direct manifestation of metabolic acidosis.