Why Cells Are Small Essays - Cell Biology, Cell Membrane

Why Cells Are Small annon Cells are the basic structural and functional units of life. As life on earth has evolved into organisms of varying complexities, two basic laws of nature have dictated why cells have remained so small. Shorter is faster. This is true both in terms of diffusion and in terms of chemical and electrical movement. By minimizing the the distance between a cell?s nucleus and and the numerous proteins and organelles that it must constantly regulate , a cell is maximizing the speed in which intercellular communications can take place while providing the ideal conditions for diffusion: a vital function in the life of a cell. Like wise, the surface area and volume of a cell are directly influential in the efficiency of the cell?s nutrient absorption and waste expulsion processes. Since the cell membrane of a eukaryotic cell is its only source of nutrition, it?s surface area must be large enough to allow the cell?s organelles to receive the materia ls it needs. This is done by maximizing the surface area to volume ratio. By using the surface area and volume equations for a sphere(4?r2 and 4/3?r3) you can estimate the surface area of a small cell(5 ?m) to be nearly 1,200,000 : 1. By modeling the growth rate of the surface area and volume of a sphere on a linear graph it?s easily discernible that as the size of the sphere increases the ratio of surface area to volume dramatically decreases until finally the volume of the sphere surpasses the surf ace area. Simply, by minimizing its size, a cell is maximizing the speed at which it can communicate, the rate at which diffusion can occur, and the amount of surface area at it?s disposal. Daniel Veilleux June 17, 1976 Period 5

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buy custom The Work of Children essay I agree that the play is a work of children. The characters in the play are acting in the capacity of young children. They are attempting to bring out the scenario in the real world of children. The evidence of the play is brought out in the statement that the play cannot be convincing or interesting as the children. It took the characters a great deal of practice to do what was, well, childs play in the nursery (Paley, 2005). Address language, conversation, and stories and their role in play, according to Paley The language use in the play is child language. It is less sensible as it picks on anything randomly and gives a narration which has no direction in itself. The language uses sound devises such as Ahzz! Water, water! Gulp, gulp, gulp, come on, drink it! The language is the child version way of communication. Similarly, the conversation lacks the connection to be one contribution discussion. Every child does her things independently but talking to each other simultaneously at the same time. Each child in the play is pursuing a fantasy but seem to be aware of the other childcontribution in the play (Layne, 2007). Select one anecdote from the book, and discuss why it holds meaning for you in the context of the concept of play One anecdote from the book I select is the victory story of Vijay. It is an interesting one because of its tragedy and the victory. The plane crash into OHare, and into the Westin tall building. The plane was fixed by the mechanics and people were fixed by the doctors. The building was not fixed because it was on fire. The victory repeats when the people go home in her story (Cooper, 2009). Compare two children mentioned in the book, and discuss how their situation represents the concept of the importance of the play The two children mentions in the play are Kostos and Vijay. The Vijay story is about a plane that crash into an OHare, and into the Westin tall building. In his story, the tragedy was the plane crashing into the building (Bjorklund, Blasi, 2011). The plane was damage, the building burns and the people were injured. There was a victory on his story. There weree fixers who help to fix the damages. The fixers are mechanics, doctors and firemen (Rodney, 2009). Address the view of the concept of fantacy and imagination, as presented by by paley, with supporting details The concept of fantasy is brought out in the story of Kostos and Vijay. The plane crashing into an OHare, and into the Westin tall building was deadly tragedy and the narrator cannot be talking about the fixing, that could happen in the real set up. It is a fantasy that there were survivors who they were treated and discharge to go home (O'Loughlin, 2009). Describe the concept, example, or situation in this book which was most meaningful to you The concept which is meaningful to me in the book is the story of Vijay tragedy and victory story. The plane that crash into an OHare, and into the Westin tall building (Bjorklund, 2011). The plane was damage, the building burns and the people were injured. There was a victory on her story. There were fixers who help to fix the damages. The fixers are mechanics, doctors and firemen (Staples, Cochran, 2008). Buy custom The Work of Children essay

Pasadena city college Essay Example | Topics and Well Written Essays - 500 words

Pasadena city college - Essay Example He noted that the truths of psychology are universal in that  people everywhere have minds, goals, desires, and beliefs.  In light of this, he defined a baby’s naà ¯ve psychology by exploring what babies know about the minds of others using the looking-time methods. He equally reckons a sympathetic parent’s acceptance to the popular claim that babies are wonderful learners. However, developmental psychologists negate this popular claim by noting that the ignorance of human babies extends well into childhood (Bloom Web). Bloom relates with other psychologists that the ignorance of human babies extends well into childhood and adopts the convectional view that young humans take a surprisingly long time to learn basic facts about the physical world and about people than they do to learn about morality. There are various studies, using the looking-methods to explore what babies know about the minds of others. In a study by his wife, Karen, he found that babies could do rudimentary math with objects. In this study, babies expect the same number of items like adults and are thus surprised if the contrary happens against their expectations. In another study, babies proved to have an actual understanding of mental life where they grasp how people think and why they act as they do. Indeed, though babies expect inanimate objects to move as the result of push-pull interactions, they expect people to move rationally in accordance with their beliefs and desires. Other studies show the existence of behavior in to ddlers that is â€Å"altruistic† in an even stronger sense where they give up their time and energy to help a stranger accomplish a difficult task. In a study investigating what babies, think about two particular kinds of action involving helping and hindering, a three-dimensional display in which real geometrical objects, manipulated like puppets, acted out the helping/hindering situations was in application. The study found out that