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.
During forced expiration, the internal intercostal muscles (excluding the interchondral part) contract and depress the rib cage. The abdominal muscles also aid expiration because, when they contract, they force abdominal organs up against the diaphragm and further decrease the volume of the thorax.xpiration, aided by contraction of abdominal muscles and. such as the scalenes and sternocleidomastoid, internal intercostal muscles, increases intrapulmonary. decreases intrapulmonary pressure to -20 mmHg or. pressure to +30 mmHg or higher.