What is the best example of a first messenger?

What is the best example of a first messenger?

Na+, which binds to the Na+/K+ATP pump and is actively transported out of a cell in exchange for K+.
Dystrophin, which associates with costameres to transmit the force of muscle contraction to the extracellular matrix.
Myosin, which binds to actin and causes muscle contraction.
Insulin, which causes the target cell to take up glucose from the blood.

A small explaination would be nice 🙂

Answer

4) Insulin the first messenger(ligand) is hormones/extracellular ones which are signaling molecules and change receptor conformation and triggers 20 messengers in G protein activation.

Insulin is a neurotransmitter, this activates tyrosine kinase by changing conformation after binding to the receptor

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