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文献和实验within the lungs to above atmospheric pressure, moving air from the lungs to the atmosphere. An adult lung contains an estimated 300 million alveoli; each alveolus is supplied by many capillaries. To reach the capillary lumen, oxygen must cross the alveolar
by the autonomic nervous system, include the cardiac and visceral muscles. Some organs contain both voluntary and involuntary muscles. Muscle contraction Each skeletal muscle consists of many elongated muscle cells, called muscle fibers
that produce sperm, transfer mature sperm from the testes, and introduce them into the female reproductive tract, where fertilization occurs. Besides supplying male sex cells (in a process called spermatogenesis), the male reproductive system plays
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