Melatonin is a relatively safe supplement when used in the short-term, and melatonin side effects are uncommon. Melatonin safety in the long-term has not been determined in randomized, controlled studies. In general melatonin appears to be relatively nontoxic, even at higher doses such as 3 to 5 mg once a day.
Best Answer: During inspiration (breathing in) our external intercostal muscle contract and the internal intercostal muscle relax together with the movement of ribs and the thorax, this increases the volume of the throacic cavity.Air pressure in our lung decrease as the volume increases.ating Newest Oldest. Best Answer: During inspiration (breathing in) our external intercostal muscle contract and the internal intercostal muscle relax together with the movement of ribs and the thorax, this increases the volume of the throacic cavity. Air pressure in our lung decrease as the volume increases.
The external intercostal muscles help to form the chest wall and move the ribs upward, increasing the thoracic cavity space, during the act of inspiration. The external intercostal muscles are innervated by the intercostal nerves. Conditions that can afflict the external intercostal muscles include costochondritis, pleurisy, myalga, repetitive strain injury, tears, strains, myopathy, atrophy, infectious myositis, neuromuscular diseases, lacerations and contusions.