1) Which statement about the electric organ is FALSE? A) the electric eel has postively charged cells on one of its body and negatively charged cells on the other B) the electric organ consists of a stack of cells with Na+ channels on one side C) an electric eel can maximize the shock delivered to a prey animal by contacting it with both ends of its body D) in the electric organ positive ions diffusing into the cells make the surrounding membrane positive 2) Which of the following sensory systems does NOT use hair cells with kinocilia and stereocilia that have ion channels at their bases? A) lateral line system B) vestibular apparatus C) hearing D) All of these sensory systems utilize hair cells with kinocilia and stereocilia.
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.
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