Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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1. What are the characteristics which differentiate annelids from anthropods? and what is the economic importance of arthropods?
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Step 1
Annelids and arthropods are the non-chordates belonging to phylum Annelida and Arthropoda respectively. Both of them have a true coelom, segmented bodies and exoskeleton.
Step 2
The differentiating characteristics include:
Characteristic | Annelids | Arthropods |
Body | The body is completely segmented and a distinct head is lacking. | Segmenation is there but less as segments are fused to form body parts. The body consists of head, thorax and abdomen (or) cephalothorax and abdomen. |
Appendages | There are no joints in appendages. | The appendages are jointed. |
Skeletal system | It is hydrostatic i.e. it has a fluid filled coelom and movement is brought about by muscles. | There is hydrostatic skeleton along with an exoskelton composed of chitin. |
Circulatory system | It is closed with many hearts. | It is open with one heart. |
Respiratory system | The gaseous exchange occurs through skin (in earthworm) or parapodia (in polychaetes). | The gaseous exchange occurs through gills (in Crab), trachea (in Cockroach) or book lungs (in Scorpions). |
Excretory system | Major organ is nephridia. | Major organ is malphigian tubule. |
Reproductive system | Most of the species are monoecious (i.e. both male and female sex organs are present in an individual) and reproduce by fertilizing each others eggs. | Most of the species are dioecious (i.e. sexes are distinct.) |
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