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Paranasal sinuses are part of the upper respiratory system.
From here, infections can spread via the nasopharynx to the middle ear or bronchi. Note locations of laryngitis, pharyngitis, sinusitis, and tonsillitis.
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Leaves of sugar maples (Acer saccharum)
Native to the north-eastern U S and Canada change color and drop from the trees in September The trees remain dormant throughout winter when prolonged cold would otherwise damage tender ...
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Ancient Warming Shrunk Horses to Housecat Size
An ancient global warming event shrunk the earliest horses down to the size of scrawny housecats according to new research that could have implications for what mammals might look like ...
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Anatomy of a eudicot leaf
The upper leaf surface is epidermis with a secreted layer of cuticle The lower leaf surface is also covered with cuticle Gas exchanges between air inside and outside of the ...
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