Breathing begins with inhalation when the contraction of the diaphragm flattens on contraction, pulling the lungs down. The contraction of these muscles increases the volume of the lungs. This reduces the air pressure in the lung to below that of the external air. This pressure difference forces air to move into the lungs where gas exchange occurs. The relaxation of the diaphragm and intercostals reduces the volume of the lungs, which then increases the air pressure inside the lung to that above the external air. This forces air out of the lungs. The cycle goes on and on. Hope this helped!
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As regards this statement on second marriages having a lower divorce rate than first marriages, this statement is <u>false</u>.
<h3>How do first marriages compare to second marriages?</h3>
According to statistics on marriage in the United States, second marriages have a higher divorce rate than first marriages.
While the data varies, over 60% of second marriages seem to end in divorce compared to around 50% for first marriages.
Find out more on divorce at brainly.com/question/7138705.
Answer:
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Explanation:
