Vocab 1-3 Flashcards
Exoskeleton
“external skeleton that supports the animal’s tissues against gravity.”
Arthropod
“invertebrate animal with an exoskeleton made of chitin; a series of paired, jointed appendages; and segmented body parts.”
Chitin
“is a long organic molecule made of sugars—similar to plant cellulose—that is arranged in layers”
Appendage
“an extension of an organism’s body”
Segmentation
“an arthropod’s body parts are divided into similar sections that have each evolved for a different function.
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Crustaceans
“group of arthropods that have two distinct body sections, a hard exoskeleton, two pairs of antennae, and one pair of appendages per segment.”
Cephalothorax
“the region of an organism in which the head and trunk region are combined into one long section”
Abdomen
“the rear portion of the organism.”
Carapace
“covers the sides of the body and protects the gills”
Mandibles
“highly adapted appendages that crush and bite food before ingestion”
Chelicerates
“arthropods that lack antennae and have six pairs of appendages, which include four pairs of walking legs”
Arachnids
“terrestrial group of chelicerates characterized by eight legs, fanglike pincers that inject venom, and the ability to produce silk.”
Book lungs
“structures built of many thin, hollow sheets of tissue that look like the pages of a book”
Spiracles
“tiny holes on the abdomen that open and close to allow oxygen to enter.”
Tracheae
“carry oxygen directly to the arachnid’s tissues”
