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Majors animal: Internal anatomy of the lamprey EC (matching)

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Structure
Function
Olfactory sac   Enlarged, internal chamber of the nostril containing a sensory epithelium that allows the lamprey to "smell" dissolved chamicals in the surrounding water  
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Pindeal organ   Photosensory organ located posterior to the nostril; controls many of the lamprey's activities that are dependent on photoperiod  
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Eye   Image-forming photoreceptive organs that lack eyelids; each eye contains a lens and a pigmented retinal layer homologous to those present in other vertebrates  
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Brain   Center of neural control; partitioned into a cerebrum, cerebellum, and medulla oblongata  
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Notochord   Primary axial support element for the body  
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Spinal cord   Posterior extension of the brain that lies dorsal to the notochord and contains spinal nerves  
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Hypophyseal sac   Terminal region of the nostril that circulates water through the nostril and over the olfactory epithelium to facilitate olfaction  
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Tongue (with teeth)   Muscular organ in the oral cavity that rasps through the body wall of the host to create seeping wounds for the lamprey to feed  
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Oral gland   Secretes anticoagulating agent during feeding that prevents the host's blood from clotting and promotes blood flow  
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Gill filaments   Highly vascular structures for gas exchange with the bloodstream  
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Branchial pouch   Respiratory chamber that houses the gill filaments and receives water from the external gill slits  
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Heart   Two-chambered organ (one atrium, one ventricle) that pumps deoxygenated blood to the gills for oxygenation and from the gills throughout the various organ systems of the body  
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Sinus venosus   Thin-walled sac where deoxygenated blood from the body collects before being passed into the atrium of the heart  
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Transverse septum   Partition that separates the coelom into the pericardial cavity and the pleuroperitoneal cavity  
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Dorsal aorta   Channels oxygenated blood from the gills to the posterior regions of the body  
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Ventral aorta   Channels blood from the heart to the gills for oxygenation  
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Esophagus   Transports food to intestine  
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Intestine   Primary site of nutrient absorption  
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Liver   Accessory digestive organ that produces digestive compounds and detoxifies many constituents of the absorbed digested compounds  
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Kidneys   Paired, flattened excretory organs that filter nitrogenous wastes from the blood  
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Created by: scandalouscanine
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