The Muslim scholar Abu Ali al-Hussain Ibn Abdullah Ibn Sina (Avicenna) made which of the following scientific claims, which could only be verified after the invention of the microscope? that the chambers of the human heart, and its major blood vessels, are separated by five valves that tuberculosis is a contagious disease, spread by organisms that are too small for the eye to see that the velocity of a falling object is faster for heavier objects than for lighter objects that the human stomach is not “concocting” food, but merely breaking down food mechanically that the human heart contains only three chambers (like the heart of an amphibian)

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A mitochondrion is a cellular organelle that serves as the site for cellular respiration and energy production (ATP or Adenosine Triphosphate). It is a double-membrane-bound organelle and is only present in eukaryotic cells.