A: The corneal reflex is an involuntary closing of the eyelids when the cornea is touched by a foreign object. The function of this reflex is to protect the eye from damage. Absence of a corneal reflex may indicate damage to the fifth and seventh cranial nerves, which mediate the reflex.
Cellular respiration is the process by which the chemical energy of food molecules is released and partially captured in the form of ATP. Carbohydrates, fats, and proteins can all be used as fuels in cellular respiration, but glucose is most commonly used as an example to examine the reactions and pathways involved.
â¢ Energy enters most ecosystems as sunlight and leaves as heat. â¢ Photosynthesis generates oxygen and organic molecules that the mitochondria of eukaryotes. use as fuel for cellular respiration. â¢ Cells harvest the chemical energy stored in organic molecules and use it to regenerate ATP, the molecule that drives most cellular work. â¢ Respiration has three key pathways: glycolysis, the citric acid cycle, and oxidative. phosphorylation.