Metabolic reactions are necessary for the body to function and maintain homeostasis. which of the following statements describes an enzyme’s role in these reactions? enzymes are used up as a part of the reaction and cannot be used again. enzymes can be any shape to bind to the substrate. enzymes are formed into lipids. enzymes are catalysts that lower the activation energy allowing the reaction to occur.

Define the apical impulse and describe its normal location, size, and duration. which abnormal conditions may affect the location of the apical impulse? explain the mechanism producing normal first and second heart sounds. describe the effect of respiration on the heart sounds. describe the characteristics of the first heart sound and its intensity at the apex of the heart and at the base. describe the characteristics of the second heart sound and its intensity at the apex of the heart and at the base.