Each receptor has sensory neurons at their tips. On receiving the information from the surrounding the start a nerve impulse. This is carried to the brain through the spinal cord. The information is transferred to different parts within the brain using relay neurons. After that, the response is again sent using nerve impulses, but this time through motor neurons. This information is passed to the effector where the response would be observed.
both aerobic respiration and fermentation produces carbon dioxide as a product but however fermentation occurs without oxygen and this was seen in the experiment.
