Structure Organization And Function Of The Human Body Biology Essay

Structure Organization And Function Of The Human Body Biology Essay Cell are the structural and functional units of all living organisms. Some organisms, such as bacteria, are unicellular, consisting of a single cell. Other organisms, such as humans, are multicellular, or have many cells-an estimated 100,000,000,000,000 cells! Each cell is an amazing world unto itself: it can take in nutrients, convert these nutrients into energy, carry out specialized functions, and reproduce as necessary. Even more amazing is that each cell stores its own set of instructions for carrying out each of these activities. Prokaryotic Cells organisms that are lack of nuclear membrane, the membrane that surrounds the nucleus of a cell. Bacteria are the best known and most studied form of prokaryotic organisms, although the recent discovery of a second group of prokaryotes, called archaea, has provided evidence of a third cellular domain of life and new insights into the origin of life itself. prokaryotes are unicellular organisms that do not develop or differentiate into multicellular forms. are capable of inhabiting almost every place on the earth, from the deep ocean, to the edges of hot springs, to just about every surface of our bodies. Prokaryotes are distinguished from eukaryotes on the basis of nuclear organization, specifically their lack of a nuclear membrane. Prokaryotes also lack any of the intracellular organelles and structures that are characteristic of eukaryotic cells. Most of the functions of organelles, such as mitochondria, chloroplasts, and the Golgi apparatus, are taken over by the prokaryotic plasma membrane. Prokaryotic cells have three architectural regions: appendages called flagella and pili-proteins attached to the cell surface; a cell envelope consisting of a capsule, a cell wall, and a plasma membrane; and a cytoplasmic region that contains the cell genome (DNA) and ribosomes and various sorts of inclusions. Eukaryotes include fungi, animals, and plants as well as some unicellular organisms. Eukaryotic cells are about 10 times the size of a prokaryote and can be as much as 1000 times greater in volume. The major and extremely significant difference between prokaryotes and eukaryotes is that eukaryotic cells contain membrane-bound compartments in which specific metabolic activities take place. Most important among these is the presence of a nucleus, a membrane-delineated compartment that houses the eukaryotic cells DNA. It is this nucleus that gives the eukaryote-literally, true nucleus-its name. Cell Structures: The Basics The Plasma Membrane-A Cells Protective Coat The outer lining of a eukaryotic cell is called the plasma membrane. This membrane serves to separate and protect a cell from its surrounding environment and is made mostly from a double layer of proteins and lipids, fat-like molecules. Embedded within this membrane are a variety of other molecules that act as channels and pumps, moving different molecules into and out of the cell. A form of plasma membrane is also found in prokaryotes, but in this organism it is usually referred to as the cell membrane. The Cytoskeleton-A Cells Scaffold The cytoskeleton is an important, complex, and dynamic cell component. It acts to organize and maintain the cells shape; anchors organelles in place; helps during endocytosis, the uptake of external materials by a cell; and moves parts of the cell in processes of growth and motility. There are a great number of proteins associated with the cytoskeleton, each controlling a cells structure by directing, bundling, and aligning filaments. The Cytoplasm-A Cells Inner Space Inside the cell there is a large fluid-filled space called the cytoplasm, sometimes called the cytosol. In prokaryotes, this space is relatively free of compartments. In eukaryotes, the cytosol is the soup within which all of the cells organelles reside. It is also the home of the cytoskeleton. The cytosol contains dissolved nutrients, helps break down waste products, and moves material around the cell through a process called cytoplasmic streaming. The nucleus often flows with the cytoplasm changing its shape as it moves. The cytoplasm also contains many salts and is an excellent conductor of electricity, creating the perfect environment for the mechanics of the cell. The function of the cytoplasm, and the organelles which reside in it, are critical for a cells survival. Genetic Material Two different kinds of genetic material exist: deoxyribonucleic acid (DNA) and ribonucleic acid (RNA). Most organisms are made of DNA, but a few viruses have RNA as their genetic material. The biological information contained in an organism is encoded in its DNA or RNA sequence. Prokaryotic genetic material is organized in a simple circular structure that rests in the cytoplasm. Eukaryotic genetic material is more complex and is divided into discrete units called genes. Human genetic material is made up of two distinct components: the nuclear genome and the mitochondrial genome. The nuclear genome is divided into 24 linear DNA molecules, each contained in a different chromosome. The mitochondrial genome is a circular DNA molecule separate from the nuclear DNA. Although the mitochondrial genome is very small, it codes for some very important proteins. Organelles The human body contains many different organs, such as the heart, lung, and kidney, with each organ performing a different function. Cells also have a set of little organs, called organelles, that are adapted and/or specialized for carrying out one or more vital functions. Organelles are found only in eukaryotes and are always surrounded by a protective membrane. It is important to know some basic facts about the following organelles. The Nucleus-A Cells Center The nucleus is the most conspicuous organelle found in a eukaryotic cell. It houses the cells chromosomes and is the place where almost all DNA replication and RNA synthesis occur. The nucleus is spheroid in shape and separated from the cytoplasm by a membrane called the nuclear envelope. The nuclear envelope isolates and protects a cells DNA from various molecules that could accidentally damage its structure or interfere with its processing. During processing, DNA is transcribed, or synthesized, into a special RNA, called mRNA. This mRNA is then transported out of the nucleus, where it is translated into a specific protein molecule. In prokaryotes, DNA processing takes place in the cytoplasm. The Ribosome-The Protein Production Machine Ribosomes are found in both prokaryotes and eukaryotes. The ribosome is a large complex composed of many molecules, including RNAs and proteins, and is responsible for processing the genetic instructions carried by an mRNA. The process of converting an mRNAs genetic code into the exact sequence of amino acids that make up a protein is called translation. Protein synthesis is extremely important to all cells, and therefore a large number of ribosomes-sometimes hundreds or even thousands-can be found throughout a cell. Ribosomes float freely in the cytoplasm or sometimes bind to another organelle called the endoplasmic reticulum. Ribosomes are composed of one large and one small subunit, each having a different function during protein synthesis. 2. Describe and distinguish between the cell and tissue organizations and systems. Tissues are the collection of similar cells that group together to perform a specialized function. The four primary tissue types in the human body: epithelial tissue, connective tissue, muscle tissue and nerve tissue. Epithelial Tissue The cells are pack tightly together and form continuous sheets that serve as linings in different parts of the body.   It serves as membranes lining organs and helping to keep the bodys organs separate, in place and protected.   Some examples of epithelial tissue are the outer layer of the skin, the inside of the mouth and stomach, and the tissue surrounding the bodys organs. Connective Tissue There are many types of connective tissue in the body.   It adds support and structure to the body.   Most types of connective tissue contain fibrous strands of the protein collagen that add strength to connective tissue.   Some examples of connective tissue include the inner layers of skin, tendons, ligaments, cartilage, bone and fat tissue.   In addition to these more recognizable forms of connective tissue, blood is also considered a form of connective tissue. Muscle Tissue Muscle tissue is a specialized tissue that can contract.   Muscle tissue contains the specialized proteins actin and myosin that slide past one another and allow movement.   Examples of muscle tissue are contained in the muscles throughout your body. Nerve Tissue Nerve tissue contains two types of cells: neurons and glial cells.   Nerve tissue has the ability to generate and conduct electrical signals in the body.   These electrical messages are managed by nerve tissue in the brain and transmitted down the spinal cord to the body.

Midterm Essay on Truth

Eli Tanenbaum Ms. Anderson English 3H, Set 4 22 January 2013 Midterm Essay Sometimes the truth has the ability to imprison one’s self; other times it can set one free. Either way, the truth is something that can decide one’s fate. Society often decides what is true and what is false; however, sometimes these truths are indeed a lie. In order to come to the realization that what was once perceived true is actually a lie, one must embark on a trek to discover the genuine truth.As evidenced by Ray Bradbury’s Fahrenheit 451, Arthur Miller’s play The Crucible, and Billy Collins’ poem â€Å"Introduction to Poetry†, it is one’s responsibility to seek his or her own truth and therefore control his or her own destiny. Guy Montag lives in a society where the majority accepts a lie as the truth. Montag and others are taught to believe that books cause harm and desolation to the people around them, and should therefore be banned from society. Afte r his wife Mildred’s attempted suicide, Montag realizes that although people in his society are alive, they are not truly living.He assumes that in the absence of books, his society has become completely absent of emotion and he yearns to discover why. Through this journey, Montag encounters an old English professor by the name of Faber who explains that it is not books that Montag desires, but the important qualities that they teach instead. He learns that books allow people to obtain information, express emotion, and think freely. After uncovering the truth, Montag then decides that it is his destiny to restore these necessary qualities, and bring life to a seemingly dead society.The idea of witchcraft has consumed the minds of the people in the town of Salem, and while some decide to fall victim to the mind control of society, others attempt to remain truthful to their moral beliefs. As the accusations of witchcraft escalate, some people in Salem fail to seek the courage t hat it takes to remain truthful. These people decide to lie and avoid being hanged or imprisoned while the others who decide to tell the truth and become victims of a corrupt society.John proctor refuses to compromise his moral values and decides to speak the truth and thus deny any witchcraft activity. This decision ultimately determines Proctor’s fate and allows him to die an honest man. Proctor’s discovery that confessing to a perceived truth is of greater consequence than telling the actual truth allows Proctor to die with dignity and honor. Poem’s are unique in the way that there is no one true answer because poems contain ambiguous text that allows different people to take away different meanings.The truth or the meaning of a poem lies behind one’s individual interpretation and therefore it is each reader’s responsibility to discover it on his or her own rather than simply being told it. Discovering the truth behind a poem can be a painstakin g task but it can also be enjoyable. No matter the difficulty of the process, discovering one’s own truth is necessary and fulfilling. By realizing the meaning of a poem, the reader has the ability to take this meaning and apply it to his or her own life and learn the true importance of poetry.In the end, John Proctor, Guy Montag and all readers of poetry discover that the truth is a valuable entity that requires great responsibility. The truth is something that cannot only benefit oneself, but also the society in which he or she lives in. The truth has the ability to shed knowledge and joy, and should therefore be discovered by everyone. As a result, one should always take part in his or her own journey to discover the truth about the society in which he or she lives in; otherwise, one never knows if they are living a life of lies in which society has proclaimed to be true.

The Argument About Descriptive Essay Samples

The Argument About Descriptive Essay Samples Among the fundamental methods for writing an email is to partition your intended audience. Emails remain to be among the best and efficient advertising and marketing platforms no matter the alterations in the advertising scene. After you have the columns laid out you are able to begin to fill them with details which help support your thesis. Descriptive Narrative Essay Example may be used mainly to recreate an occasion. Description embedded in an argument paper, for instance, could be intended to earn a position more persuasive. The next thing to do is to make an outline listing the facts of the discussion of each paragraph. Each and every detail of a certain subject plays an important part in developing a visual representation for such. Enjoy the procedure for describing the subjectit may be a rewarding experience. Describe your very best friend so the reader can picture her or him. Describe your perfect living place or the location where you live in order for your reader can picture it clearly. Describe your favourite food in order for your reader can see it and almost taste it also. Now describe your idea of a perfect pet so that he can picture it. Getting creative and descriptive can on occasion be a challenge. To start, you must have a topic. Everything is significantly simpler. Nobody cares about your organization or products. The Lost Secret of Descriptive Essay Samples The major matter to be mindful about in personal descriptive essay is that there shouldn't be any over-exaggeration. Lastly, the conclusion paragraph creates an overview of the entirety of your essay. There are essentials in every single sort of essay that you have to take note. You can not ever be too thorough when it has to do with reading the essay over again and checking for any locations that have to be reworked. Now compose an essay describing your favourite place in order for your reader will have the ability to picture it. As all our writers are gurus in academic writing, you can come across essays on several different descriptive essay topics that will help in your case. You're able to produce a more original bit of writing. Beginning a descriptive narrative essay is much as with any other essay in that you will need to capture the reader's interest. The reader should have the notion of the entire essay from the introduction. Don't panic if you are not able to get your descriptive essay right. A descriptive essay is among the essay examples which can be easily done if you're conscious of the basics of its creation. A great descriptive essay comes out of a knowledgeable and imaginative mind. It shows the reader instead of telling him. As you begin writing more descriptive essays, make certain you paint an image of your character. Our writers try their very best to develop interesting suggestions and share them with you. By looking at great sample descriptive paragraphs, you will have the ability to acquire a notion of what a superior essay resembles. New Step by Step Roadmap for Descriptive Essay Samples The vocabulary of each person has been split into passive and active. For beginner writers it's difficult to produce the perfect academic tone and fashion. Now, describe your private flag in order for your reader can see it clearly. Normally, most readers receive the best representation of something through the usage of their senses!

Analysis on Capital Structure, Dividend Policy Working...

SELDOM CORPORATE India recognizes a PSU (Public Sector Unit) and considers its executives worthy of an award for efficiency and business performance. In the corporate arena, ICICI, HDFC, HSBC etc. are the banks which are always considered for one award or the other. Some PSU banks have won awards in the past but those awards were for achieving computerization and other such ‘achievements’. Seldom has a a PSU bank been seen by corporate India as a potential avenue and as one capable of scaling new heights in the banking industry with the presence of more competitive private banks. But now SBI has started to dance, to jump and to take big strides for achieving the business goal, which hitherto have been the characteristics of the small and†¦show more content†¦Therefore, a good dividend policy under which the company declares a regular growth based dividend, the company is bound to be benefited by that which is communicated to the potential investors that is visible by the rocketing prices of the stock price of SBI. Apart from this, management at SBI is working up to the mark as it is functioning under a proper planning regarding how much to pay out as dividend and how much retain for future investments. To meet its financial requirements, SBI plans really well. State Bank utilizes it cash adequately to meet its funding requirements. Being in banking sector, where the depositors can demand their money back at any time, the bank needs to maintain the flexibility in its cash reserves and so has to declare the dividends sensibly and thus a sufficient cash balance has been maintained by the bank which is shown below: ________________________________________________________________ 2006-07 2005-06 2004-05 2003-04 (in Rs. Crores) Cash and equivalent begin of year 44,560.00 39,322.10 43,566.62 45,181.02Show MoreRelatedThe Five Practices Of Financial Management1631 Words   |  7 Pagesefficiently. The way that the finances are controlled can determine how successful the company is. The finances of a business allows for the growth of the company. The five practices of financial management: capital structure decision, investment appraisal techniques, dividend policy, working capital management and financial performance assessment are critical when assessing a company. 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