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21 terms

Worms vocabulary

This is my vocabulary homework for the "Worms" unit due Wednesday 2/24
aortic arch
a muscular blood vessel that links the blood vessels from the dorsal and ventral parts of an animal's body
cerebral ganglion
one of a pair of nerve cell clusters that serve as a primitive brain at the anterior end of some invertebrates, such as annelids
in leeches and earthworms, a thick depression of the body wall that functions in reproduction
in the digestive systems of birds and some invertebrates, a sac or pouch that temporarily stores food
a waxy or fatty and watertight layer on the external wall of epidermal cells
a parasite that lives on a host but does not enter the host's body
any of various parasites that live in the internal organs of animals (especially intestinal worms)
a muscular tube that connects the pharynx to the stomach
flame cell
in a flat worm, cell that has flagella/cillia that move waste products through the body
an enlargement of the digestive tract of some invertebrates, such as annelids and insects, that grinds food; a muscular region in the digestive tract of birds that grinds and softens food
intermediate host
a host that gives food and shelter to immature stages of a parasite
a tubule through which some invertebrates eliminate wastes
in polychaete annelid worms, one of the two flap-shaped appendages that are used for locomotion or gas exchange
in flatworms, the muscular tube that leads from the mouth to the gastrovascular cavity; in animals with a digestive tract, the passage from the mouth to the esophagus
primary host
the host from which an adult parasite gets its nourishment and in which reproduction occurs
one of the many body sections of a tapeworm; contains reproductive organs
the head of a tapeworm, which has hooks and suckers to adhere to the host tissues
seminal receptacle
a saclike organ of female or hermaphroditic invertebrates that stores sperm
seminal vesicle
one of two glandular structures in male vertebrates that hold and secrete seminal fluid
the external skin of an organism; on the external surface of a parasitic invertebrate, a layer that counters the defenses of the host's body
bristle-like structures that help segmented worms move