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.
Q48
Platyhelminthes are flatworms having many classes of triploblastic and are acoelomate flatworms that lack a true gut, i.e., their gut is incomplete. The organisms shown in the image are Pseudobiceros bedfordi which are commonly known as the Persian carpet flatworm. These organisms are found in shallow marine habitats such as reefs. Their bodies are very thin elongated for oval-shaped. These organisms are hermaphrodites, because of which went two individuals are these species find each other, they get engaged in an event known as "penis fence" or "sperm battle" with the help of their double-prong penis stylet and try to inseminate the each other by piercing each other's skin as insemination can occur through any part of the organism's skin.
Step by step
Solved in 2 steps