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In fact, the rate of gas diffusion is regarded as one of the main limiting factors (along with weight of the exoskeleton) that limits the size of insects. [2] Periods in Earth's ancient history, however, such as the Carboniferous , featured much higher oxygen levels (up to 35%) that allowed larger insects, such as meganeura , along with ...
Carbon dioxide (CO 2) is transferred from returning blood back into gaseous form in the lungs and exhaled through the lower respiratory tract and then the upper, to complete the process of breathing. Unlike the trachea and bronchi , the upper airway is a collapsible, compliant tube.
Animation of diaphragmatic breathing with the diaphragm shown in green. Diaphragmatic breathing, abdominal breathing, belly breathing, [1] or deep breathing, [2] is breathing that is done by contracting the diaphragm, a muscle located horizontally between the thoracic cavity and abdominal cavity.