Cancer of cells consequences in the formation of multitudes of cells called tumours, this is due to the increased and uncontrolled division of the cell. So, lung malignant neoplastic disease is a disease which affects our respiratory organ lungs ensuing in uncontrolled growing and division of lung epithelial cells. Besides lung malignant neoplastic disease tends to be metastatic which means that it tends to distribute and transport malignant neoplastic disease from the lungs to other organic structure variety meats. Lung malignant neoplastic disease can infect the cells run alonging the bronchial air passages in this instance it is called bronchogenic malignant neoplastic disease.
If such trends continue, close to one out of every two people in the United States will eventually develop some form of the disease and cancer will be the most common cause of death.
To put it another way, in a country of roughly million people we are expecting more than million new cancer cases! In the face of such numbers, it is not surprising that there is widespread interest in and fear of the topic of cancer biology.
The good news is that enormous progress has been made in the past few decades in unravelling the cellular and molecular mechanisms that underlie the development of cancer. The study of cancer biology, once restricted almost entirely to the medical school curriculum, is becoming a topic of broad relevance to biologists as they uncover the roles of various genes and their protein products in the abnormal behavior of cancer cells.
As it turns out, investigating the properties of cancer cells Cancer essay biology deepened our understanding of normal cells and, conversely, our rapidly expanding knowledge about the behavior of normal cells is providing numerous insights into the properties of cancer cells. One group consists of benign tumors, which grow in a confined local area.
In contrast, malignant tumors can invade surrounding tissues, enter the bloodstream, and spread to distant parts of the body by a process called metastasis.
Cancer is disease in which there is uncontrolled cell growth growth Cancer essay biology division beyond the normal limitsinvasion intrusion on and destruction of adjacent tissuesand sometimes metastasis spread to other locations in the body via lymph or blood.
Medical term for cancer is malignant neoplasm. Cancer is a disease in which abnormal cells proliferate in an uncontrolled fashion and spread through the body.
Such cells can arise in a variety of tissues and organs, and each of these sites contains different cell types that may be affected. The net result is more than kinds of cancer distinguished from one another on the basis of where they originate and the cell type involved.
In multicellular organisms, the regulation of proliferation, differentiation and survival of individual cells are carefully regulated. The common cause in all cancers is the acquisition of abnormalities in the genetic material of the cancer cell and its progeny.
A substance causing abnormality in the cell leading to cancer is known as carcinogen.
Substances that cause DNA mutations are known as mutagens. All mutagens do not cause cancers and mutagens that cause cancers are known as carcinogens. Tobacco smoking is associated with lung cancer and bladder cancer. Prolonged exposure to asbestos fibers is associated with mesothelioma.
Alcohol is a chemical carcinogen that promotes cancers through their stimulating effect on the rate of cell mitosis. Faster rates of mitosis leaves less time for repair enzymes to repair damaged DNA during DNA replication, increasing the likelihood of a genetic mistake. A mistake made during mitosis can lead to the daughter cells receiving the wrong number of chromosomes.
Sources of ionizing radiation, such as radon gas, can cause cancer. Prolonged exposure to ultraviolet radiation from the sun can lead to melanoma and other skin malignancies.
Many cancers originate from a viral infection. The main viruses associated with human cancers are human papilloma virus, hepatitis B and hepatitis C virus, Epstein-Barr virus, and human T-lymphotropic virus. The mode of virally-induced tumors can be divided into two, acutely-transforming or slowly-transforming.
In acutely transforming viruses, the viral particles carry a gene that encodes for an overactive oncogene called viral-oncogene v-oncand the infected cell is transformed as soon as v-onc is expressed. In contrast, in slowly-transforming viruses, the virus genome is inserted, especially as viral genome insertion is an obligatory part of retroviruses, near a proto-oncogene in the host genome.
The viral promoter or other transcription regulation elements in turn cause overexpression of that proto-oncogene, which in turn induces uncontrolled cellular proliferation. Because viral genome insertion is not specific to proto-oncogenes and the chance of insertion near that proto-oncogene is low, slowly-transforming viruses have very long tumor latency compared to acutely-transforming viruses, which already carry the viral oncogene.
In addition to viruses, bacteria can also cause cancer for example the chronic infection of the wall of the stomach with Helicobacter pylori causes gastric cancer. Some hormones can act in a similar manner to non-mutagenic carcinogens in that they may stimulate excessive cell growth.
A well-established example is the role of hyper estrogenic states in promoting endometrial cancer. Certain other immune deficiency states ex.
A number of cancers are caused due to hereditary causes wherein there is a defective tumor suppressor allele. Individuals develop cancer from tumors hiding inside organ transplants. In fact, most of the increase in cancer rates has a somewhat different explanation; Cancer strikes older people more frequently than younger people, and more cancer cases are being seen simply because people are living longer than they did in the past.
The increase in average lifespan, due mainly to the availability of vaccines and antibiotics that have lowered death rates from infectious diseases, means that more and more people are living long enough to develop cancer.
The various kinds of cancer differ significantly in terms of how frequently they arise Figure 1, left. The most common type is skin cancer, which accounts for roughly half of all human cancers. The next group in terms of frequency in the United States includes cancers of the prostate, breast, lung, and colon the latter is often combined with cancer of the rectum and designated colorectal cancer.
Of the dozens of other kinds of cancer routinely encountered, none accounts for more than a few percent of the total number of cancer cases.Biology Review and Study Guide Cell Division and Cancer Cells divide for two main reasons: first, the larger a cell becomes, the more demands the cell has on its DNA.
Second, a large cell has more trouble moving enough food in and enough waste out. Sample biology essay The biology essay below has been submitted to us by a student in order to help you with your studies.
Please ensure that you reference our essays correctly. Essay Cancer INTRODUCTION In the American society, cancer is the disease most feared by the majority of people within the U.S.
Cancer has been known and described throughout history. In the early s nearly 6 million cancer cases and more than 4 million deaths have been reported worldwide, every year.
The most fatal cancer in the world is lung cancer, which has grown drastically since the. Signs And Symptoms Of Prostate Cancer Biology Essay. Normally, early prostate malignant neoplastic disease does non do any symptoms - Signs And Symptoms Of Prostate Cancer Biology Essay introduction.
Often it is diagnosed when holding an elevated PSA noticed during a medical examination. Essay Biology Field Study A general description of the area with reasons why the field study is being conducted. Geological overview Bicentennial Park which is located on the shoreline of Home bush Bay is a natural heritage site which features a vital wetland ecosystem and a large area of parkland colonized by a vast range flora and fauna.
REDISCOVERING BIOLOGY the development of cancer. The development of molecular biological techniques may help in the diagnosis of potential cancers in .