In this video the mechanism of Smooth muscle relaxation have been discussed in detail.
The smooth muscle surrounds the endothelium tissue which produces the signalling molecules like Nitric oxide.
The Nitric oxide is produced via G-Protein cascade which involves IP3 secondary messenger.
The following have been discussed in the video :

1.Mechanism of Smooth muscle relaxation
2.Role of Nitric Oxide in Vasodilation
3.Structure of Blood vessel ( brief )
4.IP3 Inositol Pathway.
5.Calmodulin Activation.

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