Both vasopressin (ADH) and oxytocin are released from the posterior pituitary. Which of the following statements are true regarding these hormones?
? Both ADH and oxytocin have two cysteines that form a disulfide bonds.
? Vasopressin secreted by pigs differs by one amino acid when compared to that secreted by cats or dogs, but has biologically equivalent activity.
? Oxytocin differs from vasopressin by two amino acids (at positions 3 and 8), but it has biologically equivalent activity.
? Although the second messenger pathway triggered by V1 receptors in vascular smooth muscle cells is different from the second messenger pathway triggered by V2 receptors in the kidney, vasopressin activates both pathways by interacting with the receptors in these different locations.