Human Cells

Authors note: this is a 5 paragraph essay to compare and contrast 4 different cells found in the human body.

           Have you ever wondered how many cells are in a human body? Or what a purpose of a cell really is? A cell is fascinating, they help with many things such as, carrying oxygen throughout the body, help heal wounds, fix broken bones, and there is so much more. There is a cell in the body for everything, there is a cell in/ on everything too. For instance a bacteria is a cell and bacteria is on everything. Although the human body had over 100 trillion cells, there are four very important cells that do very different things.

            First of all, what is a cell? What is the purpose of a cell? “A cell is the basic unit of life” (What is the Purpose of a Cell?). A cell is meant to help and do almost everything. One cell can’t do it all so there is trillions of different cells. Cells are small living organisms that are in everything. Some things are unicellular or are one cell such as bacteria. Other things are multicellular or are made up of more than one cell. Humans are multicellular because humans have about 100,000,000,000,000 cells in our body (What is a Cell?). Cells is the basic thing to life. It is said that life goes the same rate as a cell. Meaning, that cells are living organisms and that if we live from them that they are in everything. The nutrients from food has cells. Because of cells we are able to get energy, nutrients, and able to reproduce because the cell is a life function to help (What is the Purpose of a Cell?). knowing what a cell is and it purpose, there are some very important cells that are needed in the body.

            Secondly, two of the human cells are the Microglial cell and a Dendritic cell. Seeing how rare Dendritic cells are, they were harder to find what they do. The DCs are meant to help bone marrow and help it grow and stay healthy. Seeing how DCs expand will help the bone being healthy and strong with the cell expanding and getting stronger. This cell is to keep nutrients in bone marrow and keep our bones healthy and strong (Wieder). And the Microglial cell is Microglial cells are cells to control and help control the central nervous system in a human body. These cells are to protect and help the central nervous system from any harm, the brain is what controls the system and the cells are meant to help it and protect it. These are only two of the most important cells in the human body.

            And lastly, two more important cells are the Osteoclast cell and the Erythrocyte cell. Erythrocytes or Red Blood Cells make up 99% of all blood cells. Their job is to carry oxygen throughout the body. The shape of the cell makes it easier for them to move through gas changes and go through the blood stream better (Liang). Osteoclastes are cells that are meant to restore bones when something happens to them. They take out everything bad that could get into a bone and potentially ruin it or break it (The cell biology of osteoclast function).

            In conclusion, the human body has more cells than you could ever believe. The human body has over 100 trillion cells! Some are more important than others but the four that I believe are the most important human body cells are Erythrocyte cells for oxygen throughout the body, Dendritic cells to keep our bone marrow healthy and strong, Osteoclast cells to repair broken or injured bones, and Microglia cells to help control the central nervous system. Bacteria consist of one cell; others such as humans consist of 100 trillion cells.

Bibliography

Liang, Barbara. General Anatomy & Physiology General Blood. 17 April 2012 <http://www.wisc-online.com/Objects/ViewObject.aspx?ID=AP14604>.

Physiology of Microglia. 18 November 2011. 19 April 2012 <http://physrev.physiology.org/content/91/2/461.full>.

The cell biology of osteoclast function. 2000. 18 April 2012 <http://jcs.biologists.org/content/113/3/377.full.pdf>.

What is a Cell? 30 March 2004. 20 April 2012 <http://www.ncbi.nlm.nih.gov/About/primer/genetics_cell.html>.

What is the Purpose of a Cell? 20 April 2012 <www.ehow.com/facts_5439557_purpose-cell.html>.

Wieder, Eric. ISCT. May 2003. 17 April 2012 <http://www.celltherapysociety.org/files/PDF/Resources/OnLine_Dendritic_Education_Brochure.pdf>.

It's Worth the Fight

Authors Note: This is a 5 paragraph essay to score a 9 or higher in theme and text analysis for my goals.

            Have you ever lost something incredibly important before; such as your two best friends? In the novel “Sent” by Margret Peterson Haddix, Jonah and his little sister Kathrine go back in time to save their two best friends. The theme of Regain of Friendship is huge in this novel. This theme is important for many reasons such as, you should always keep your friends close, once you have your friends it is good to never lose them, and the fact that it is their best friends. Many people can relate to this too, for instance, many people in the world, or even in Asa Clark Middle School lose friends every day. They may not want to lose them but it is important that if you do lose your friend, get them back.

            First off, when you lose a friend it is always hard. In “Sent” they actually “lose” their friends. They lose them because they go back in time on accident and then have no way back. In real life it might be that you get in a fight and lose them and feels like you’re going back in time when you didn’t even know them. In the novel, they do whatever they have too to get them back. They go back in time themselves to get them. In real life it feels like that but you should try to get them. This is text to world because it happens every day but in the book the make it feels like the end of the world, to some people, that is what it could feel like.

            Secondly, you should always keep your friends close in real life because once you lose them it might be the last time that they talk to you. For Jonah in “Sent” he didn’t want that to happens so he had to do whatever he could to get them from being out of his life for the rest of his life. That happens in real life but most everybody would rather it didn’t, if somebody had no friends, they wouldn’t want to have friends and possibly do bad things to themselves or to others. Sure in “Sent” Jonah has other friends, but he lost his best friends and would do anything he can to get them.

            And lastly, anybody would do anything to help out their best friend no matter what happened to them; whether it be they break their spine and are put in a wheelchair, or they get in a car accident a loose their arms and legs. It shouldn’t matter what happened to them, you should always be there to help. For Jonah, he travel back in time to the 15^th century, went into an epic battle that was a life or death situation, and managed to get back alive and safely.

            In conclusion, the theme of Regain of Friendship is a big theme to this novel and this novel can relate in a way to text to world because it is kind of saying that you should keep your friends close because once you lose them it is hard to get them back. Jonah goes through something that is physically impossible to get his best friends back, people in real life may have be able to do the easiest things ever to get them back, but either way, don’t lose your friends.