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.
During cellular respiration, oxygen and glucose are used to create the useful product ATP. ATP is a usable form of energy that cells use, and it can be transported to any cell in the body. The by-products carbon dioxide and water are also created during cellular respiration. Carbon dioxide is disposed of through exhalation while water is excreted from the body through urine or sweat.