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We suspect that gargling and dry sugar both stimulate the phrenic nerve which controls the diaphragm.

The phrenic nerve pacer Sadie's parents have fundraised for works a little like a cardiac pace maker as it will tell the diaphragm when to move and breathe, her father Andrew said.

Mr Hucknall, from Wilford, remains under observation after a respiratory consultant found the virus had damaged his lung and the phrenic nerve controlling the diaphragm.

The suction and swallow simultaneously stimulate two nerves, the phrenic and vagus nerves, prompting the diaphragm to contract and the epiglottis — a flap that covers the windpipe during swallowing — to close.

A specialist in Brasília told O Globo that Bolsonaro’s hiccups could be caused by the dental implant because of oral and phrenic nerve relationships.