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.
How do the olfactory organs of Scoliodon and Rana differ?
Scolidon, commonly called dogfish, belongs to the class of elasmobranchii. They are cold-blooded, carnivorous and cartilaginous fish that inhabits in marine waters. Rana tigrina commonly called Indian bull frog, belongs to the class of amphibia. They live in aquatic habitat like, ponds, pools and lakes. They are cold-blooded animals that can survive in water (gills and skin) as well as on land (lungs). All the frogs undergoes metamorphosis during their life cycle that is, change in shape and development of internal and external organs. Respiration is an exchange of gases (oxygen and carbon dioxide) between the organism and the environment. This exchange provides energy for the functioning of metabolic processes in the system.
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