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How are the symmetry and the nervous system characterized in echinoderms?
Adult echinoderms, with cnidarians, are the animals that present radial symmetry, i.e., their body structures are dispersed around a center. The radial symmetry in echinoderms though is a secondary radial symmetry, as their larval stage has bilateral symmetry and the radial pattern appears only in adult individuals (there are some few adult echinoderms with lateral symmetry). All other animals have lateral symmetry with exception of poriferans (no symmetry is explained for them).
Echinoderms do not present cephalization and they have a disperse network of nerves and neurons made of a neural ring around the mouth and of radial nerves that ramify to follow the pentaradial structure of the body.
The cytoskeleton is a network of very little tubules and filaments spread throughout the cytoplasm of eukaryotic cells. It is made of microtubules, microfilaments and intermediate
Explain the Steps for Injecting Insulin Injection It is important to teach patient to take injections at regular times, 30 to 60 minutes before meals. Take insulin everyday, ev
TYPES E.R. consists of two types - 1. Rough E.R. 2. Smooth E.R. R o ugh E.R. S m o o th E.R.
Chromatin is made of DNA molecules associated to proteins known as histones.
Formation of female gametes: Ovule develops from a cushion like part of the ovary called the PLACENTA. Ovule is connected to the placenta by a stalk known as FUNICLE. The
Calvin cycle (the aka Calvin-Benson Cycle or the Carbon Fixation) is the series of biochemical, enzyme-mediated reactions during which the atmospheric carbon dioxide is reduced an
Mechanisms Of Endosseous Integration Three terms may be used to describe individual aspects of bone formation process that can occur around implants. They are Osteoconduction,
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list and explain the modes of nutrition
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