Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Locomotion in Echinodermata
Locomotion in echinoderms is accomplished through a unique canalicular system which is termed as the water-vascular system. This system is characteristic of echinoderms, in most of that it is quite well developed. It consists of a series of canals derived from the coelom. The canals consist of a fluid. Sea water has free access to the system via a perforated sieve plate called the madreporite on the aboral side of the animal. The fluid is much more like seawater but has a high content of potassium ions. Some proteins and several types of amoebocytes float in it. The structural organisation of the water-vascular system is chiefly the same in all echinoderms, though deviations from the basic plan occur. To study the components of the system, we might take the water-vascular system of the star-fish, as typical example. Its main component applicable from the point of view of locomotion consists of a pentagonal circumoral vessel that is termed as the ambulacral ring canal. From the ring canal are given off five radial vessels. Every radial canal extends up to the tip of the arm. It gives off a large number of side vessels along its course. Each side vessel leads into a tube-foot or podium, which is a hollow conical or cylindrical process with an ampulla and a terminal sucker. A Valve is present at the junction of lateral vessel with the tube-foot.
Q. What is hematosis? In humans where does hematosis occur? Hematosis is the oxygenation of the blood, venous blood (oxygen-poor) after hematosis is transformed into arterial b
Q. What are few examples of human cells that produce proteins for exportation? Which cytoplasmic organelle is expected to be abundant and well-developed in those cells? Special
Q. What are the major cells of the connective tissue proper? What is the name given to the intercellular material that surrounds these cells? The major cells of the connective
What are the main constituents of the earth's atmosphere in our time? The present atmosphere of the earth is constituted mostly of molecular nitrogen (N2) and molecular oxygen
Explain about the Weight cycling - energy balance? There are a number of obese people who keep losing and gaining weight a number of times in their lives. This is called the Yo
Q. What are the events that mark the end and the beginning of the second interphase period and what happens in the cell in this period? The second interphase period is the S, i
Do plants placed under an environment drier than the habitat where they are used to living have a reduction or an increase in the time during which their stomata remain open? I
Q. What are instances of nematodes? Ascaris, filaria and hookworm, all parasites of humans, are instance of nematodes also known as roundworms. Q. Are nematodes exclusively
Various acute complications of diabetes mellitus are described in this unit. Acute complications develop within a short period of time. These are due to improper treatment of diabe
why do ecological models commonly have limited applications?
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd