D) pulmonary muscles contract and pull on the outer surface of the lungs. E) a positive respiratory pressure is created when the diaphragm relaxes. 2. Which of the following occurs with the exhalation of air from human lungs? A) The

The excretory system eliminates wastes from the body while also maintaining water and chemical balances. The main organs of the excretory system are the kidneys, the ureters, the bladder, the urethra, the skin, and the lungs. The main things that

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