Raji is on his way to his native in his car for his weekend holidays after finishing the office work. As he is very tired, he begins to feel drowsy. He turns up the car stereo volume, opens the car window and has sips of ice-cold water. How do these actions keep him awake? The increase in the number of sensory stimuli he receives is relayed to the cerebral cortex which gets activated and prevents sleeping.

Explanation

When he turned up the car setreo volume, he received auditory stimulus. When he opened the car window, he received gentle breeze that is tactile stimulus. When he sipped the ice-cold water, he received the stimulus of ice chillness through pacinian corpuscles of the skin.