Vertebrates have a wide range of sensory modalities. Which of the following was NOT present in early vertebrates? photoreceptors with different opsins to allow for color vision electoreception a vestibular aparatus containing calcium crytals enabling animals to detect which way is up vocalization or sound production fpr communication
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.
Vertebrates have a wide range of sensory modalities. Which of the following was NOT present in early vertebrates?
photoreceptors with different opsins to allow for color vision
electoreception
a vestibular aparatus containing calcium crytals enabling animals to detect which way is up
vocalization or sound production fpr communication
Animals which comes under the phylum chordata have certain common characteristics including the presence of a dorsal nerve cord, pharyngeal gill slits and a notochord. Their symmetry is bilateral, and are triploblastic with organ system level of organization.
There are three sub-phyla under chordata which are urochordata, cephalochordata and Vertebrata. In cephalochordates the notochord is seen throughout the body while in urochordates it is seen only in the tail region of it's larva.
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