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6 Cards in this Set
- Front
- Back
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closed circulatory system
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a circulatory system in which the heart circulates blood through a network f vessels that form a closed loop the blood does nt leave the blood vessels and materials diffuse across the walls of the vessels
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open circulatory system
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a circulatory system in which the circulatory fluid is not contained entirely within vessels a heart pumps fluid through vessels that empty intospaces called sinuses
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three main body parts of an arthropod
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the head ,the thorax ,and the abdomen
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relationship between parasite and host
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parasites sometimes live off of the hosts blood food or body its self
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4 characteristics of arthropods
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a segmented body with specialized parts ,jointed limbs,an exoskeleton , and a well-developed nervous system
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functions of neurons
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they bring information from tissues and organs into the central nervous system ,they transmit signals, and they connect neurons to the central nervous system
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