Ultimate ABP Review Exam Questions & Answers 2024/2025
Segmentation - ANSWERSThe repetition of similar, paired organs and structures throughout the body.
Can refer to overall body or particular structures.
Nephridium - ANSWERSRefers to parts that are involved in excretion.
What syste...
Segmentation - ANSWERSThe repetition of similar, paired organs and structures throughout the body.
Can refer to overall body or particular structures.
Nephridium - ANSWERSRefers to parts that are involved in excretion.
What systems are typically segmented? Which ones arent? - ANSWERSThe excretory system
(metanephridium), the nervous system, the circulatory system, and the circular muscles are all
segmented.
Tissues from the ecto or mesoderm are normally segmented.
Digestive system is never segmented. Longitudinal muscles aren't either. Typically, tissue systems arising
from the endoderm are not segmented.
What are some phyla that have segmentation? - ANSWERSAll annelida, phylum arthropoda, phylum
chordata.
Are proglottids segmented? - ANSWERSTechnically no. They can live and do all the biological processes
on their own.
What are the functions of segmentation? (3) - ANSWERS1. Localized control of body movements.
2. More powerful movements.
3. Redundancy of organs in case one gets damage.
, Explain how localized control of body movements is an advantage of segmentation? - ANSWERSMuscles
(at least the circulatory ones) are not continuous throughout the body.
Worms can alternate contractions, allowing different segments to move differently at the same time.
Provides peristaltic movement.
Peristaltic contractions - ANSWERSWaves of muscle contractions and relaxations throughout the body.
Particularly the circulatory muscles in annelids.
How does having the ability to make more powerful movements an advantage or segmentation? -
ANSWERSHaving a segmented coelom allows for animals to put pressure on different parts of the body
while having none on others.
This gives them a lot of digging potential.
How is the redundancy of organs in a segmented organism an advantage? - ANSWERSMultiple copies of
the same organ. If one gets damage, then there will be enough copies so the organism lives.
What is the disadvantage to being segmented? - ANSWERSMany small organs are less efficient than one
large organ.
What are the body plan features of phylum Annelida? (4) - ANSWERS1. Vermiform body design.
2. Large coelom
3. Segmented
4. Thin cuticle.
What are the characteristics of a cuticle? (3) - ANSWERS1. External
2. Non-cellular
3. Non-living
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