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Definitions for Apologia Biology - Module #13 (2nd Edition)

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Term
Definition
vertebrae   segments of bone or some other hard substance that are arranged into a backbone  
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notochord   a rod of tough, flexible material that runs the length of a creature's body, providing the majority of its support  
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endoskeleton   a skeleton on the inside of a creature's body, typically composed of bone or cartilage  
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bone marrow   a soft tissue inside the bone that produces blood cells  
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axial skeleton   the portion of the skeleton that supports and protects the head, neck, and trunk  
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appendicular skeleton   the portion of the skeleton that attaches to the axial skeleton and has the limbs attached to it  
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closed circulatory system   a circulatory system in which the oxygen-carrying blood cells never leave the blood vessels  
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arteries   blood vessels that carry blood away from the heart  
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capillaries   tiny, thin-walled blood vessels that allow the exchange of gases and nutrients between the blood and the cells of the body  
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veins   blood vessels that carry blood back to the heart  
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olfactory lobes   the lobes of the brain that receive signals from the receptors in the nose  
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cerebrum   the lobes of the brain that integrate sensory information and coordinate the creature's response to that information  
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optic lobes   the lobes of the brain that receive signals from the receptors in the eyes  
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cerebellum   the lobe that controls involuntary actions and refines muscle movement  
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medulla oblongata   the lobes that coordinate vital functions, such as those of the circulatory and respiratory systems, and transport signals from the brain to the spinal cord  
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internal fertilization   the process by which the male places sperm inside the female's body, where the eggs are fertilized  
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external fertilization   the process by which the female lays eggs and the male fertilizes them once they are outside of the female  
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oviparous development   development that occurs in an eggs that is hatched outside the female's body  
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ovoviviparous development   development that occurs in an egg that is hatched inside the female's body  
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anadromous   a life cycle in which creatures are hatched in fresh water, migrate to salt water as adults, and then go back to fresh water in order to reproduce  
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bile   a mixture of salts and phospholipids that aids in the breakdown of fat  
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atrium   a heart chamber that receives blood  
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ventricle   a heart chamber from which blood is pumped out  
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ectothermic   lacking an internal mechanism for regulating body heat  
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hibernation   a state of extremely low metabolism and respiration, accompanied by lower-than-normal body temperatures  
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