Which of the following types of muscle are voluntary?

A. Erythropoietin (EPO): Stimulates red blood cell production in the bone marrow; it does not directly act on the kidneys to conserve water.
B. Aldosterone: Promotes sodium reabsorption (and potassium excretion) in the distal nephron; water retention can follow sodium reabsorption, but its primary target is sodium balance.
C. Renin: An enzyme released by the kidney that initiates the RAAS cascade; it indirectly influences water balance through downstream hormones but is not the hormone that directly increases water reabsorption.
D. Anti-diuretic hormone (ADH): Acts on the renal collecting ducts to insert aquaporin channels, increasing water reabsorption and concentrating the urine.

A. Glucagon: Raises blood glucose by stimulating glycogenolysis and gluconeogenesis in the liver, so it does not decrease glucose.
B. Cortisol: Increases blood glucose through gluconeogenesis and reducing peripheral glucose uptake during stress.
C. Insulin: Lowers blood glucose by promoting cellular uptake of glucose and stimulating glycogen synthesis and storage.
D. Aldosterone: Regulates sodium and potassium balance in the kidneys and indirectly influences fluid volume, not directly responsible for lowering blood glucose.