Anatomy and Physiology of Special Sensory Organs
Sensory organs can be labeled as special sensory structures that permit sight, hearing, odor, and flavor. Sensory structures permitting proprioception, touch, thermal, and pain perception can be classified as more advanced sensory organs. The sensory neurons are trained to find out modifications in the external and internal conditions so that a person's body can react to that change. A stimulus is the first signal that is recognized by any sensory receptor of the body. Stimulus is an impulse generated when there is a change in the surroundings of a person. For example, a heated environment will alert the brain through the thermal sensory organs and generate a reflex accordingly.
Sensory Receptors
The human sensory system is one of the most complex and highly evolved structures, which processes a myriad of incoming messages. This well-coordinated system helps an organism or individual to respond to external stimuli, appropriately. The sensory receptors are an important part of the sensory system. These receptors are specialized epidermal cells that respond to external environmental stimuli. These receptors consist of structural and support cells that form the peripheral unit of the receptor and the neural dendrites which receive and detect the external stimuli.
Define sensory feedback and visual feedback with a description of the principle.
The controlling and communication center of the human body is known as the brain. The brain receives, evaluates, and processes several inputs and manages the action and initiates the response.
A feedback mechanism can be described as the loop system wherein the system responds to a perturbation. The response may be in the same direction (as in positive feedback) or in the opposite direction (as in negative feedback).
In physiology, a feedback mechanism involves a biological process, a signal, or a mechanism that can either initiate (or accelerate) or inhibit (or slow down) a process.
A feedback mechanism may be observed at the level of cells, organisms, ecosystems, or the biosphere. It regulates homeostasis or balance to achieve a certain range or level of optimal condition.
Or feedback may be from the nervous system that allows the occurrence of any action.
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