ANATOMICAL TRAVELOGUE / SCIENCE PHOTO LIBRARY ANATOMICAL TRAVELOGUE / SCIENCE PHOTO LIBRARY
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Visualisation of the trachea, an elastic tube of U-shaped hyaline cartilage bars. The cartilage maintains the shape of the lumen of the wind pipe while the smooth muscle that joins each ring provides elasticity. External skeletal muscles such as the rectus abdominal, obliques, intercostal muscles, and pectoralis muscles can be used to voluntarily alter the normal respiratory cycle.
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