A: First of all, let's learn about nitric oxide: nitric oxide as a messenger molecule. When endothelial cells send relaxation instructions to muscles to promote blood circulation, they will produce some nitric oxide molecules, which are very small and easily cross the cell membrane. Smooth muscle cells around blood vessels will relax after receiving signals, thus dilating blood vessels.

Nitric oxide can also play a role in nervous system cells. Its effect on peripheral nerve endings.

Nitric oxide molecules produced by immune system can not only resist the invasion of microorganisms into human body, but also prevent the proliferation of cancer cells and the spread of tumor cells to some extent.

It can be seen that nitric oxide can increase the blood flow of blood vessels, which is of great significance to fitness, because the energy in our body comes from ATP stored in the body and made at any time, and it needs blood circulation to bring it to the target muscles and organs. If the blood vessels dilate, the blood volume will increase, and the nutrients will also increase. Our training results and achievements will increase, which is the help of nitric oxide to exercise.