Which of the following hormone crosses the plasma membrane for its action?
(A) Epinephrine (B) Glucagon (C) Insulin (D) Thyroxine
(D) Intracellular hormone receptors: - - Several hormones, including adrenal & gonadal steroid hormones, thyroid hormones, retinoid hormones and vitamin D, bind with protein receptors inside the cell. - Because these hormones are lipid soluble. Cell surface receptors: - - All the peptide hormones uses it - They are water soluble. - They act secondary messengers (CGMP, CAMP etc.) Examples: Catecholamines (epinephrine, dopamine) Insulin Glucagon Prolactin Growth hormone etc.