Chemically,hormones are divided into which groups?

  • A
    Peptide,polypeptide,protein hormones
  • B
    Steroids
  • C
    Iodothyronines and amino-acid derivatives
  • D
    All of the above

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What is the role of the second messenger in hormone action?

In heart cells,which molecule acts as a second messenger and increases the contraction of muscle cells in response to adrenaline?

Statement $-I :$ Iodothyronines can cross the plasma membrane of a cell.
Statement $-II :$ Receptors of iodothyronines are present on the plasma membrane.

Which of the following is an example of negative feedback control in humans?

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

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