Which one of the following is not a secondary | vedclass

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(D) The correct answer is $D$. Secondary messengers are low-molecular-weight,diffusible molecules used to relay signals within a cell. They are synthe

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Sodium

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(D) The correct answer is $D$. Secondary messengers are low-molecular-weight,diffusible molecules used to relay signals within a cell. They are synthesized or released by specific enzymatic reactions,usually as a result of an external signal received by a transmembrane receptor. $cAMP$,$cGMP$,and $Ca^{2+}$ act as secondary messengers and are located within the cytoplasm. Sodium $(Na^+)$ is an essential mineral ion involved in maintaining membrane potential and nerve impulse conduction,but it does not function as a secondary messenger in hormone signaling pathways.

Column-$I$	Column-$II$
$P$. Peptide, polypeptide, protein hormones	$I$. Epinephrine
$Q$. Steroids	$II$. Thyroid hormones
$R$. Iodothyronines	$III$. Cortisol, testosterone, estradiol, progesterone
$S$. Amino acid derivatives	$IV$. Hormones of pancreas, pituitary, and hypothalamus

Which one of the following is not a secondary messenger in hormone action?

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