Make money online!
www.adf.ly
Use a URL shortener service that pays.
SiteGround
www.siteground.com
Web Hosting Services Crafted with Care!

AURELIA: LOCOMOTION, RESPIRATION, EXCRETION, NERVOUS SYSTEM AND SENSE ORGANS

Published in Zoology
Wednesday, 19 April 2017 19:15
Jelly fish or Aurelia is marine medusa. It is free living and free swimming form.
 
Jelly fish swimming:
 
Aurelia (jelly fish) freely swims in the sea water. Its highly developed musculature is responsible for bringing swimming movements in Aurelia. Con­tractions of the muscles will bring contractions of the medusa. Because of these contractions water is expelled forcible from subumbrellar surface and the body is propelled forwards. Such type of movement is called hydro propulsion. While it is swimming, the balance of the medusa is maintained by tentaculocysts.
 
Jellyfish Respiration:
 
In Aurelia(jelly fish) medusa there are no specific respiratory organs. Oxygen dissolved in the water will diffuse into the body. C02 present in the body parts will diffuse out into the water through general body surface. Thus respiration is carried on. Sub genital pits may take up respiration.
 
Jellyfish Excretion:
 
In Aurelia medusa specific excretory organs are absent. The nitrogenous wastes formed in the body will be diffused out through the general body surface. Thus Aurelia medusa will show locomotion, respiration and excretion.
 
Jellyfish Nervous System and Sense Organs:
 
In the animal kingdom nervous system is developed for the first time in Cnidaria. In Aurelia (jelly fish) diffused nervous system is seen.
 
In the ectoderm many nerve cells are present. They are called proto neurons. From the corners of these cells, nerves will arise. All the nerves of the nerve cells of ectoderm will form a network. Such nerve net will show a concentration as a nerve ring on the margin of the umbrella.
 
1) The nerve ring is thickened at the regions of rhopalia. These thickenings are called rhopalial ganglia.
2) The nerve net is thick on the sub-umbreliar surface" because of the well developed musculature on that side.
3) In the endoderm also nerve cells are present. Their nerves will also form a nerve net.
 
Sense Organs : Aurelia medusa shows 8 tentaculocysts on the margin at 4 per-radial and 4 adradial positions.
 
Tentaculocyst : This is also called rhopalia. Each rhopaiium contains stato­cyst, ocellus and 2 olfactory pits.
 
In the marginal lappet of the umbrella's margin club shaped tentaculocyst is present. It shows a hood. Into this tentaculocyst circular canal will extend. At the base of the hood one olfactory depression is present. It is called superior olfactory pit. On the inner side of the tentaculocyst another pit is present. It is called inner olfactory pit. These two olfactory pits will work as chemo receptors.
 
Below the hood region an ocellus is present. This ocellus works as photoreceptor.
 
At the distal part of the lentaculocyst statolith cells are present. Each cell contains a statolith composed of calcium sulphate and phosphates. Below this group of statolith cells sensory epidermis is present. It shows sensory cells which are connected with subumbrellar nerve net. The group of statolith cells and sensary epidermis will form the statocyst. It maintains the equilibrium of the animal.

Useful Sites

  • NCBI

    National Center for Biotechnology Information
  • LTO

    Lab Tests Online® by AACC
  • ASCP

    American Society for Clinical Pathology
  • ASM

    American Society for Microbiology
  • The Medical Library®

    Project of BioScience.pk

Sponsored Links

Daily Science
www.bioscience.pk
The Science News app that will get you to the breaking news.
BioScience.pk App
www.bioscience.pk
Put vital info into the palm of your hand.
ASH Job Center
www.jobcenter.hematology.org
By American Society of Hemotology
Advertisement

Sponsored Links

SiteGround
www.siteground.com
Web Hosting Services Crafted with Care!
Daily Science
www.bioscience.pk
The Science News app that will get you to the breaking news.
ASH Job Center
www.jobcenter.hematology.org
By American Society of Hemotology
Online Digital Library
www.bioscience.pk
Free Downloads Medical Books.
Make money online!
www.adf.ly
Use a URL shortener service that pays.
BioScience.pk App
www.bioscience.pk
Put vital info into the palm of your hand.

Connect With Us

Contact Us

All comments and suggestions about this web site are very welcome and a valuable source of information for us. Thanks!

Tel: +(92) 302 970 8985-6

Email: This email address is being protected from spambots. You need JavaScript enabled to view it.

Website: https://www.bioscience.pk

Our Sponsors

Findeen.com

By using BioScience.pk you agree to our use of cookies to enhance your experience on this website.