Lab Practical 2 - Chapter 8
Terms in this set (53)
Which phylum do the flatworms belong to?
During embryonic development in flatworms, the _____ differentiates into _____.
_____ cells function primarily in fluid balance in the body, with excretion being a secondary role.
Two longitudinal nerve cords connected by a series of transverse nerves
ladder-like nervous system
Free-living species typically possess a concentration of nervous tissue and sensory structures at the anterior end of the body. This condition is known as ________.
Class of Platyhelminthes: free-living flatworms with a ventral mouth. ex: planarians
Class of Platyhelminthes: internal parasites with leaf-shaped body and anterior mouth. ex: flukes
Class of Platyhelminthes: internal parasites with long, ribbon-like body composed of proglottids and no mouth.
Triploblastic body plan: animals whose central space is filled with tissue [mesoderm]. no true body cavity exists. ex: flatworms.
Triploblastic body plan: animals with a central body cavity that lies between the gastrodermis and the mesoderm. ex: roundworms
Triploblastic body plan: animals with a central body cavity that lies within the mesoderm. ex: earthworms, molluscs, arthropods, echinoderms, chordates.
The ______ of a planaria sense light (shadows and direct light, not images) and the ______ are chemoreceptors that detect dissolved chemicals in the water.
Primary function of flame cells? Secondary?
Flukes use _____ for attachment to the hosts inner body wall or organs.
Flukes are protected by a thin _____ that prevents the digestive enzymes of the host from from dissolved them.
Flukes are monoecious and are capable of self-fertilization-- a criteria needed for the solitary lifestyle of an ________.
The digestive system of _____ (Class ______) includes the mouth, muscular pharynx, a short esophagus, and two branches of the gastrovascular cavity.
What kind of larvae do flukes have?
What is the liver flukes two intermediate hosts?
What does the miracidia larvae produce inside the snail?
Fluke structure: specialized for attachment to host; used in feeding.
Fluke structure: secondary point of attachment to host.
Fluke structure: muscular tube for pumping in blood and body fluids from host.
Fluke structure: forked tube for digestion and distribution of nutrients throughout body (reduced in flukes)
Fluke structure: stores sperm and transports sperm to genital pore.
Fluke structure: receives sperm and moves it to the seminal receptacle.
Fluke structure: receives sperm and stores it (often for the life of the fluke) eventually moving it to the uterus where eggs are fertilized.
Fluke structure: eggs are combined with yolk and shelled before passing to the uterus.
yolk gland and yolk duct
Fluke structure: collect metabolic waste from the flame cells.
excretory canals and bladder
Fluke structure: releases metabolic waste products out of body
What infects a human with a liver fluke?
Mircadia pass through several stages: _____ then _____ then ____ dividing asexually to produce thousands of additional larvae.
sporocyte, redia, cercaria
Tapeworms (Phylum ____) have a thin tough coating on their body known as a ______ which prevents them from being digested.
Tapeworms have a series of continuously growing segments called _______.
Where do new segments on a tapeworm form?
behind the scolex
What is the scolex consisted of on a tapeworm?
Where is the scolex located on a species of Phylum Cestoda?
T/F: Tapeworm suckers are used for feeding.
F; used for attachment.
T/F: Each proglottid in tapeworms contains its own reproductive unit.
What are proglottids in tapeworms connected by?
excretory canals and longitudinal nerves
Tapeworm structure: anterior end of tapeworm; lacks sensory structures but possesses modifications for attachment to intestinal wall of host.
Tapeworm structure: modified structures of scolex for attachment to host.
hooks and suckers
Tapeworm structure: constricted portion of signifying posterior end of scolex; marks the site of origin of immature proglottids.
Tapeworm structure: newly produced segment of the tapeworm that has undeveloped reproductive organs.
Tapeworm structure: longitudinal channels running along the outer margins of the body that deliver metabolic waste products out of the tapeworm.
Tapeworm structure: tapeworm segment that has functional reproductive organs.
Tapeworm structure: eggs are combined with yolk and shelled before passing to the uterus.
yolk gland and yolk duct
Tapeworm structure: shelled, fertilized eggs are stored here until proglottid drops off of tapeworm body.
Tapeworm structure: canal through which sperm pass as they exit the proglottid through the genital pore.
Tapeworm structure: external opening common to the male and female reproductive tracts of the tapeworm; sperm exit and enter proglottids through this opening.
Tapeworm structure: tapeworm segment containing ripe fertilized eggs; this segment is ready to drop off the tapeworm body and be eliminated from the host in feces.
T/F: Phylum Platyhelminthes' simple nervous system isn't capable of integrating multiple stimuli nor able to draw associations between them.
F; they can be conditioned.
Where must the cercaria travel too in order to make it to humans, their primary host?
their second intermediate host (ex: sheep, fish)