Answered: What are the characteristics which…

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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