This website uses cookies to ensure you have the best experience. Learn more

Compare The Structure And Function O The Cnidocyte In Cnidarians To The Colloblast In The Ctenophores

482 words - 2 pages

The two phyla Cnidaria and Ctentophora makeup the radiate animals. Most radiates have tentacles or oral extensible projections around the oral end that are armed with cells that may function in defense and capture prey. The cells found within the tentacles are structurally and functionally unique to each phylum, such as the cindocytes in Cnidarians and colloblasts in Ctenophores. Cnidarians capture prey with special stinging cells called cindocytes. These cells are found throughout the epidermis but are particularly abundant in the tentacles. Cnidocytes contain a cilium or modified cilium structure with a kinetosome at its base. This structure is known as the cnidocil and ...view middle of the document...

The osmotic pressure falls rapidly, opening the operculum and increasing the hydrostatic pressure. The increased pressure everts the thread and drives the nematocyst from the cnidocyte. When the nematocyst is discharged, its cnidocyte is absorbed and a new one replaces it. In the Hydra, there are three functional types of nematocysts. First, Pentrants, these are comprised of a tube that is open at the tip and usually armed with barbs and spines. When they are discharged, they penetrate the prey and inject poison. The open end of the 'thread' /filament may inject protein toxin that produces a sting. FIG2 DISCHARGED NEMATOCYSTSecond, some nematocysts function by entanglement such as the volvents. These cnidocytes have a tube that is closed at the end, unarmed, and coiled. When discharged they wrap around an entangle prey. The third type are glutinants. The tube of glutinants is open and sticky. This type responds only to mechanical stimuli and it secretes and adhesive substance used in locomotion and attachment.Nematocysts are absent in Ctenophores with the exception of Haeckelia rubra. They are supplied with adhesive cells called colloblasts. The colloblast produce a secretion of use in capturing small animals, which serve as food. They do not function to inject toxins into prey.Cnidarians possess nematocysts that are abundant in tentacles. These function to either entangle, sting, or adhere to prey. However, in the Ctenophores the tentacles possess colloblast. Colloblast are structurally different to nematocyst. They function to adhere to prey.

Find Another Essay On Compare the structure and Function o the cnidocyte in Cnidarians to the colloblast in the Ctenophores

The nobel savage in the last o

1105 words - 4 pages puts all on the line for a wanted love in his life. Compare this to the grotesque and murderous Huron's who seem to have no respect for anything. They treat others like dirt and same with the land they live on. Which can be related to the attitude of the whites who use the land for all its riches. The Hurons will kill every beaver, every fox in the land to trade with the white man for pelts and whiskey. The heroic ego of the Mohicans was

"Life Story", which is an essay about the race to find the structure and function of the DNA macromolecule

2428 words - 10 pages The hunt for where life comes from and what life consists of involved many different personalities, places, and events that came together to reveal an answer that had particularly become of interest in the years preceding the discovery, as much of the world tried to move away from death and closer to life. In 1953, James Watson and Francis Crick presented the structure and function of the nucleic acid DNA, the macromolecule found in living

The HR Function and Its Implications in the Organization

810 words - 4 pages Summary Statement: This paper examines in detail HR function and its implications in an organization. The paper discusses how the HR function is handled in an organization. The paper explains what are the efficient ways to use it in an organization, its division and supervision strategies. Human resource function is the process by which the HR manager can ensure that the organization has correct number of employees with correct skills in

Compare and Contrast of Henry O Tanner’s painting "The head of a Jew in Palestine” wit"h Alice Pike Barneys´s painting " The head of a Negro Boy"

1033 words - 5 pages of art, I decided to compare Henry O Tanner’s painting “The head of a Jew in Palestine” with Alice Pike Barneys painting, “The head of a Negro Boy” Henry Tanner was a realism painter during the Harlem renaissance. Henry tanner was born in Pennsylvania in the year 1869. He attended school at the academy of fine arts in Pennsylvania. While working on exhibits in Paris, his work began to gain international attention. He was one the first African


2876 words - 12 pages COMPARE AND CONTRAST BOURDIEU'S APPROACHTO THE AGENCY/STRUCTURE DICHOTOMYWITH THAT OF GIDDENSIn recent years, several authors have attempted to deal with the problem of the relationship between agency and social structure. This has manifested itself in the theory of structuration. Anthony Giddens' structuration theory is one of the best-known and most articulated efforts to integrate agency and structure. His theory proposes a duality of

The Core Function of Police in Reference to Wilson and Keeling's Broken Windows Thesis

2848 words - 11 pages The Core Function of Police in Reference to Wilson and Keeling's Broken Windows Thesis In considering whether the core function of the Police should be to maintain order, there are a number of issues, both historic and current, which need to be taken into consideration. For example, the maintenance of what constitutes “order” can be interpreted differently by different communities i.e. urban and rural. The expectations of

The Organizational Systems and Structure Found in "The Bee Movie" and How it Relates to Society

1716 words - 7 pages , and that is the system that they were under, have been under and will be under, in order to keep order and maintain the structure of the organization. In terms of cause and effect, the cause was the regulatory order needed to maintain the current state of systematically making honey and only making honey and the effect was that all they did was – make honey. The hive was in full bureaucratic mode and focused on organizational stability and

The role and function of religion in society

1914 words - 8 pages social solidarity is reinforced, deviant behaviour is restrained and social change restricted. In maintaining social solidarity, religion acts as a conservative force. When it fails to perform this function new ideas emerge, which become the new religion. So Durkheim regarded Nationalism and Communism as the new religions of industrial society, taking over from Christianity but performing the same essential functions. As a result Durkheim and other

What is the function of the Inspector in the play 'An Inspector Calls'? Consider what he represents, the way he affects structure and pace, his effect on the characters and his effect on the audience

2012 words - 8 pages technique to enthral his audience and keep them focused on the events on stage.Priestley's function for the Inspector in "An Inspector Calls" is to influence the individuals he interviewed in different ways. For example, Shelia was very effected by what the Inspector had said while Mrs Birling, the complete opposite to her compassionate daughter. She wasn?t phased anything the Inspector said to her and still retained her capitalist opinions, and gloated

The Function of Ethics and Morality in American Democracy

574 words - 2 pages function in society?The laws in our country are based on such rules or principles. The founding fathers of the United States, although most of them were deists, used the Bible as a guide to making most of the constitutional laws. If we did not have those sets of rules, then America would have a very chaotic society. Friedrich Nietzsche thought that it is not human nature to be moral, and that "religions seek to enforce a moral code of conduct by

Compare and Contrast the structure of "Waiting for Godot" with the structure of any traditional play

962 words - 4 pages universe is void - nothing to believe in but nothingness. There is no moral ethical code. There are just people existing, being only for themselves, and sometimes by themselves. (Gordon, 2002)"Waiting for Godot", is part of the Theatre of the Absurd. This implies that it is meant to be irrational. Absurd theatre does away with the concepts of drama, chronological plot, logical language, themes, and recognizable settings. There is also a split

Similar Essays

Compare The Structure And Function Of The Xylem And Phloem

1486 words - 6 pages diffusion. Both stems and roots contain xylem vessels and phloem tubes. In a stem these are grouped into vascular bundles arranged in a ring. In a root these are arranged in the centre forming a structure called the stele.Xylem tissue has the dual functions of support and transport. It contains several different types of cells these are vessel elements, traceids, fibres and parenchyma cells. In contrast to this phloem tissue is living and comprises of

Structure And Function Of The Spleen

1110 words - 4 pages the left colic flexure1, in the left hyperchondriac region, between the stomach and diaphragm. Posteriorly, it is associated with the left 9th through 11th ribs, separated from them by the diaphragm. The diaphragmatic surface of the spleen is convexly curved to fit the concavity of the diaphragm. The posterior and inferior borders are rounded, whereas its anterior and superior borders are sharp and notched. The anterior aspect of the spleen

Evolution Of Organisms Shows The Development Of Structure To Function

1320 words - 5 pages , structure and function of the organisms, including humans, portray the incredible creations of the nature (Campbell et al. 2008). The phylogenic tree reveals the evolutionary history of animals simply. In this phylogenic tree, humans and other animals that are familiar to us are included in phylum chordates. Possessing a dorsal notochord or hollow nerve cord is the significant development of chordates. The nerve cord is a flexible structure and

Structure Of The Lost Honour O

1117 words - 4 pages Heinrich Böll uses his novel, The Lost Honour of Katharina Blum, to attack modern journalistic ethics as well as the values of contemporary Germany. The structure of this novel is important to conveying his message. He uses a police report format, differences in chapter lengths, narrator or author intervention, a subtitle, and the extensive use of the 'puddle' metaphor. All these things contribute towards the message in the text. The puddle