Cyclic adenosine monophosphate $(cAMP)$ was discovered by

Which one of the following pairs of hormones are the examples of those that can easily pass through the cell membrane of the target cell and bind to a receptor inside it (mostly in the nucleus)?

"Secondary messenger" is

Which of the following statements is correct regarding the endocrine system?

According to the mechanism of hormone action,if the receptor molecule is removed from the target organ,the target organ will:

Action of the peptide hormone on a target cell is mediated by