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IGHS Winkels
Zoology Chapter 27
| Term | Definition |
|---|---|
| acoelomates | "without coelom" |
| coelom | a fluid-filled coelom forms between the tissues of flatworms |
| pharynx | a muscular tube near the mouth |
| flame cells | specialized cells that remove excess water such as ammonia and urea |
| ganglia | a group of nerve cells that control the nervous system |
| eyespot | a group of cells that can detect changes in the amount of light in their(flatworms) environment |
| hermaphrodite | is an individual that has both male and female reproductive organs |
| fission | an organism splits in two, and each half grows new parts to become a complete organism |
| scolex | the head of an adult tapeworm |
| proglottids | the segments that make up most of the worm's body |
| testes | male reproductive organs |
| pseudocoelom | body cavity is lined only partially with tissue derived from the mesoderm |
| anus | the posterior opening of the digestive tract |
| septa | internal walls between each segment of an annelid body |
| setae | bristles that are attached to each body segment |
| crop | part of the digestive tract where food is stored |
| gizzard | part of the digestive tract where food is ground into smaller pieces |
| closed circulatory system | blood is contained within a network of blood vessels |
| gill | an organ specialized for the exchange of gases underwater |
| nephridia | the excretory organ that filter fluid in the coelom |
| clitiellum | a band of thickened, specialized sements, secretes a mucus ring into which eggs and sperm are released |
| trochophore | free-swimming larval stage of many aquatic mollusks |
| foot | takes many forms in a mollusks including flat, spade-shaped burrowing, and tentacles for capturing prey |
| mantle | thin layer of tissue that covers most of the mollusk's body |
| shell | made by glands in the mantle that secrete calcium carbonate |
| visceral mass | located just below the mantle, consists of the internal organs |
| radula | a flexible tongue-shaped structure used for feeding in slugs and snails |
| siphon | tubelike structure through which water enters and leaves the body of a mollusk |
| open circulatory system | blood is pumped through vessels by a simple heart |
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Winkels
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