BIOL 2030 Study Guide - Quiz Guide: Optic Nerve, Thalamus, Diencephalon
14 Mar 2017
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Skeletal system: unlike other higher vertebrates, the shark does not have a bony skeleton but instead a skeleton composed of cartilage. Mouth structures: teeth these are deri(cid:448)ed fro(cid:373) the s(cid:272)ales (cid:449)hi(cid:272)h (cid:272)o(cid:448)er the shark"s (cid:271)ody! They ha(cid:448)e (cid:271)ee(cid:374) adapted to function as cutting structures. The teeth of a shark are replaced regularly as they wear out: pharynx the cavity caudal from the spiracles to the esophagus. The gill slits open on either side of the caudal region. The gill rakers are cartilaginous protrusions which prevent large particles of food from entering the gills: esophagus the connection between the pharynx to the stomach. In the shark the esophagus is very short and wide. Stomach this j-shaped organ is composed of a cardiac portion which lies near to the heard and a limb portion which is after the bend of the stomach. The stomach ends at the pyloric sphincter a muscular ring which opens or closes the stomach into the intestine.
