The human body is constantly receiving stimuli from the environment through various sensory systems. Here are three primary ways:
Sight (Vision):
The eyes receive light stimuli from the environment. Light enters the eye through the cornea, passes through the pupil, and is focused by the lens onto the retina at the back of the eye. The retina contains photoreceptor cells called rods and cones, which convert light energy into electrical signals. These signals are then transmitted via the optic nerve to the brain, where they are interpreted as visual information.
Touch (Tactile Sensation):
The skin is the primary organ for receiving tactile stimuli from the environment. It contains various types of sensory receptors, including mechanoreceptors, thermoreceptors, and nociceptors. Mechanoreceptors detect pressure, vibration, and touch, while thermoreceptors detect temperature changes, and nociceptors detect pain. When these receptors are activated by external stimuli such as pressure, temperature, or pain, they generate electrical signals that are transmitted via nerve fibers to the brain, where they are interpreted as tactile sensations.