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The other part of the respiratory system is the muscles, such as the intercostals (muscles between the ribs) and the diaphragm, which cause the lungs to expand and contract. When the size of the lungs changes, so does the pressure inside, leading to air either coming in (inhalation) or being forced out (exhalation).

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Jan 15,  · These medications are often used with other drugs, such as a diuretic. Aldosterone antagonists block the hormone aldosterone, which sometimes causes salt and fluid retention, contributing to high blood pressure. They are usually prescribed for those whose high blood pressure is difficult to control or who have diabetes or heart failure.