38. The oceanic zone is much less productive per square meter than the neritic zone because: (a) it does not receive enough sunlight (b) the nutrient level is so low (c) there are fewer organisms that live there (d) it is very cold. Which one of the following statements is NOT true of the neritic zone? (a) The water is relatively shallow. (b) The water extends beyond the continental shelf toward the open ocean. (c) It is the most productive zone in the ocean. (d) The water in this zone is nutrient rich from upwellings and runoff from the land. 39. 40. Large variations in salinity levels occur in: (c) the neritic zone (d) a swamp (e) an estuary.
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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