ABP Lab Final Exam Questions & Answers 2024/2025
In Nereis what role do the parapodia play in locomotion? - ANSWERSThey play a major role in locomotion as they can move them to help 'swim' and stay above the ocean floor, though they want to stay. Each is on both attached laterally to the sides...
In Nereis what role do the parapodia play in locomotion? - ANSWERSThey play a major role in
locomotion as they can move them to help 'swim' and stay above the ocean floor, though they want to
stay. Each is on both attached laterally to the sides and have chaetae extended. They are like paddles
though more often push against substrate for crawling.
In Neireis do the chaetae play any visible role in locomotion - ANSWERSIt is difficult to see though they
add more surface area which could help though are more likely aid in gas exchange.
In Nereis how does the worm's body move? - ANSWERSThey are more free to move in any direction as
they have so many parapodia to direct them. Very often it is sinusoidal though if they lacked parapodia
the most common movement is via peristalsis.
In Nereis we should be able to see the dorsal blood vessel. Does it move rhythmically and if so, what do
you think might cause this? - ANSWERSYes it does move rhythmically, pulsing like a wave. This can be
caused by the movement of the parapodia, the contracting of longitudinal and circular muscles help
moving the blood.
Are the segmentation and parapodia development uniform, or does Nereis exhibit tagmatization? -
ANSWERSThey only have observable tagmosis and the end of the body by the head, the parapodia
development is otherwise uniform
Based on the presence of anterior structures speculate on how Nereis obtains its food. - ANSWERSThey
can project forward their pharynx and use their jaws to grasp their prey. They use retractor muscles to
draw then pharynx, jaws, and food back in.
Speculate as to the function of the acicula. - ANSWERSThey are chitinous and used to support the
parapodia when they are moving for locomotion more option.
, The largest lobe of the notopodium is very thin and vascularized in Nereis. What additional function does
this suggest for the parapodia - ANSWERSThey are thin and vascularized like gills and can be used for gas
exchange and respiration, also chaetae
Relate the extent of the development of each muscle time to the locomotion of Nereis -
ANSWERSCircular- they are new muscles in each segment so peristalsis can occur
Longitudinal- runs through the body so motion can be continuous throughout, they can contract and
extend segments individually
Retractor muscles: specialized for feeding pushing out and redrawing it back it
What type of feeding does Chaetopterus use? - ANSWERSFilter feeding, they use their parapodia to draw
water into and through their food cup by capturing the small floating particles
Compare parapodia development in Chaetopterus to that of Nereis. - ANSWERSChatopterus- more flap
like so they can efficiently draw in water
Nereis- small and has many so they can be much more motile
For a tub-dweller like Chaetopterus, what advantage is there to being so highly tagmatized. -
ANSWERSThey can have many specialized features as they don't move often. They have individualized
heads, parapodia, digestive systems and even special organs for secreting the tube, they have three
distinct parts: the anterior, middle (which is basically two) and the posterior.
Note the structure and the size of the parapodia on the tubeworm. - ANSWERSThey are small and not
used for motion, though slightly wider than expected for water movement
How do the appendages of Eudistylia's (tubeworm) head region differ from those of Nereis and other
polycheates seen today. - ANSWERSThey have no need for a specialized jaw or pharynx, they have
tentacle like feathers to catch prey and bring it to their mouth.
In what ways does the body of Eudystylia differ from that of Nereis. What might be the reason for these
differences (associate body form with where it lives, and how it obtains food) - ANSWERSThey have
feathery tentacle for catching prey and they don't move what so ever during their life cycle. They are
attached to base whereas Nereis moves to find it food.
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