Which one of the following is not a secondary messenger in hormone action?
Correct answer: D. Sodium
- A. cAMP
- B. cGMP
- C. Calcium
- D. Sodium
Explanation
Secondary messengers are low weight diffusible molecules that are used to relay signals within a cell. They are synthesized or released by specific enzymatic reactions, usually as a result of an external signal that is received by a transmembrane receptor. cAMP, cGMP and Ca 2+ act as secondary messengers and are located within the cytoplasm. Sodium is an essential nutrient that helps to maintain blood volume and keeps nerves functioning.
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About Coordination and Control
Coordination depends on receptors, neurons, synapses and nerve impulses, with reflex actions traced through the reflex arc and the roles of major brain regions. Chemical coordination covers endocrine glands and hormones, including how hormones regulate growth, metabolism, reproduction and internal balance, unlike rapid nervous control.
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