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Cells stop growing at a certain size because as they grow larger, they become less efficient because it take longer for the materials that enter the cell to reach the center to be distributed.
Wiki User
∙ 12y ago
Wiki User
∙ 13y agoThere are many reasons why cells do not divide. Here are a few reason (but keep in mind this is not everything)
(1) Cellular program
Many cells are programmed not to divide. They remain in the cell cycle stage known as G0. Although they are metabolically active, they are not dividing or preparing to divide. A good example of this is neurons.
(2) Lack of extracellular signals
Mammalian cells need extracellular signals to tell them to proliferate. Without these signals the cell is not able to progress though the cell cycle and thus not able to divide.
(3) DNA damage
There are "check points" throughout the cell cycle that are designed to check for DNA damage. If damage is detected, the cell is not allowed to proceed though the cell cycle until the DNA is repaired. If the cell is unable to repair the damage it commits "suicide" (apoptosis).
(4) Age
Because of the way in which linear chromosomes are replicated, each round of replication results in the shortening of chromosome. Eventually, the chromosomes are shortened to such an extent that the cell is induced to commit "suicide" (apoptosis).
Wiki User
∙ 14y agocould be a lot of things but the main problem with growing is deep inside the cell cycle, in G1 phase -could be a problem with de- condensation of chromatin and then the chromosomes can not divide and make another cell
in S phase - the synthesis of histones or duplication of centrioles can be damaged.
in G2 phase- not enought accumulation of factors for cell division.
and pro-phase ,prometaphase, anaphase, telophase and cytokinesis are less problematic stages, most of the problems occur in the interphase( g1 , s &g2).
Wiki User
∙ 9y agoCells do not grow. However, they do divide. Cells stop dividing when telomeres at the ends of chromosomes become too short to be replicated.
Wiki User
∙ 8y agoIf you stop eating your body has nothing to make new cells.
contact with other cells
Wiki User
∙ 9y agoSome factors that can stop normal cells from growing include lack of essential nutrients. It also includes contact inhibition.
Wiki User
∙ 12y agoTemperature is too cold or too hot. Lack of food. Death of the cells. Presence of poisons. Lack of oxygen if the cells need oxygen.
Wiki User
∙ 13y agoDeath.
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Which factors affect water potential in living cells?
Some factors which influence water potential include gravity, pressure, and solute concentration. Adding solute lowers the water potential. An increase of pressure will increase the water potential.
Do all cells grow and divide at the same time?
Most cells do not continuously divide. These cells enter the G0 phase of the cell cycle after dividing and do not begin diving again until stimulated to do so. Growth factors, nutrients, etc. are required to make these start dividing again. When these cells are needed, the appropriate growth factors will be introduced, and then they will begin dividing again. Some cells do continuously divide, such as epithelial (skin) cells. The cells that keep on dividing, even though they are not supposed to, are cancer cells. They eat up all your nutrients and form tumors etc.
What are the names of some plant cells?
helloThe famous names of some plant cells aremeristamparenchymaxylemphelomsclerenchymaplus plant cells are real wankers like you xx
Do plant and animal cells lack nuclei?
No, cells can have nuclei irrespective of whether they are plant or animal; some don't however (red blood cells for example).
What are some biotic factors in the dessert?
Biotic factors are essentially the living factors in a certain ecosystem. In a desert (note the spelling), the biotic factors include cacti, lizards, trees in oases, etc.
What factors will come in mind for growing some seeds?
Factors which will come in mind for growing some seeds are as follow:- => preparation of soil => sowing => manuring => irrigation of crops => weeding => protection of crops => harvesting => storage
What type of Down syndrome is 'Mosaic'?
its where some cells are "down syndrome" cells and some are "typical" cells. meaning some cells have three sets of the 21st chromosome and some have the normal 2 sets.
How the presence of a cancerous tumor affect the biological processes?
Cancerous tumours are formed from cells which have had mutations in very specific genes which have allowed them to survive independantly of cells around them in the body. Some of these key genes code for growth factors and other proteins which affect normal body cells. Often the tumour cell mutations cause upregulation of these growth factors causing neighbouring healthy cells to be affected in unusual ways.
People who are heterozygous for sickle cell disease are generally healthy because?
Theyhave some normal hemoglobin in their red blood cells.
How are cancer cells different from normal cells in the lung tissue?
Cancer cells and normal cells in lung tissue differ in several key aspects, primarily due to genetic mutations and alterations in cellular behavior that drive the development and progression of cancer. Here are some of the fundamental differences between cancer cells and normal lung cells: Uncontrolled Growth and Division: Cancer Cells: Cancer cells have lost the normal regulatory mechanisms that control cell growth and division. They divide and replicate at an abnormally rapid rate, leading to the formation of tumors. Normal Cells: Normal lung cells follow a controlled and regulated process of growth and division, ensuring that new cells are produced only when needed. Genetic Mutations: Cancer Cells: Cancer cells often harbor genetic mutations or alterations in their DNA. These mutations can activate oncogenes (genes that promote cell growth) and inhibit tumor suppressor genes (genes that regulate cell division and prevent tumor formation). Normal Cells: Normal lung cells have intact and functional DNA that maintains the proper balance between cell growth and cell death. Loss of Apoptosis: Cancer Cells: Cancer cells can evade apoptosis, which is a programmed cell death mechanism that eliminates damaged or abnormal cells. This allows cancer cells to survive and accumulate, contributing to tumor growth. Normal Cells: Normal lung cells undergo apoptosis when they are damaged or no longer needed, ensuring proper tissue maintenance and homeostasis. Invasion and Metastasis: Cancer Cells: Cancer cells can invade surrounding tissues and spread to distant parts of the body through the bloodstream or lymphatic system, a process known as metastasis. Normal Cells: Normal lung cells remain localized to their specific tissue and do not invade neighboring tissues or spread to other parts of the body. Angiogenesis: Cancer Cells: Cancer cells can stimulate the formation of new blood vessels (angiogenesis) to supply the growing tumor with nutrients and oxygen. Normal Cells: Normal lung cells do not induce excessive angiogenesis unless needed for tissue repair or growth. Cell Shape and Organization: Cancer Cells: Cancer cells often have irregular shapes, sizes, and organization. They may form disorganized clusters within tumors. Normal Cells: Normal lung cells have a specific and organized structure, contributing to the proper functioning of lung tissue. Functionality: Cancer Cells: Cancer cells do not perform the specialized functions of normal lung cells. Instead, they divert resources toward rapid proliferation. Normal Cells: Normal lung cells carry out their specialized functions, such as gas exchange and mucus production, to maintain respiratory health. These differences collectively contribute to the aggressive and destructive behavior of cancer cells compared to normal cells in lung tissue. Understanding these distinctions is crucial for developing targeted therapies that selectively target cancer cells while preserving the health and function of normal cells.
How can scientists know when cells are cancerous?
Because they appear mutated compared to other "normal" cells. Multiple mutations in one cell leads to cancer. Some look similar to normal cells, most don't, google for images of different types of cancer cells
What is the difference between cancer cells and normal cells?
Cancer cells normally have a defect in their receptor proteins on the membrane. There are several growth receptors on the surface of cells, and if one of them is faulty, cancer may form. The cancerous mass will continue to divide if there is no negative feedback from the cells surrounding it. In addtition to not being able to receive normal signals that regulate the cell cycle, cancer cells do not stop dividing when growth factors are depleted, simply put cancer cells don't require nutrients to grow, however they may still receive nutrients. As long as a cancer cell is provided with nutrients they may grow indefinately until some random point in the cycle where they may stop, rather then stopping at checkpoints in the normal cell cycle, making them somewhat "immortal". These are the most common differences in cancer cells and normal cells.
What are cancer cells and where do they begin?
Our cells grow by dividing and growing, dividing and growing, so that 1 cell becomes 2, 2 become 4 and so on. WHen we are born our cells grow to the required size and then the coding in our DNA turns off their growth. The growth can be switched on again if the body needs the cells for a reason, such as fighting infection. However, due to errors in the coding some cells either do not switch off, or are switched on again in error. These cells are cancers. They don't begin in any specific location, but can occur anywhere. About 20% of people will die of some form of cancer - and we don't know whay they got it... we know of some factors that increase the risk of cancer, but we still can't pinpoint what causes them in such a large proportion of the population.
How does chemotherapeutic drugs kill the cancer cells and not kill the human?
Basically, chemo drugs target the fastest-growing cells. So they kill cancer cells, but also some fast-growing human cells like those in hair follicles and the gastrointestinal tract (that's why chemo patients lose their hair and feel nauseated).
Why are scientists researching stem cells?
Stem cells would be crucial in learning how to cure some genetic diseases and growing organs for people who need organ transplants.
If you have been growing some animal cells in culture The cells grow well for several weeks and then their growth slows down You conduct some tests and determine that there is a lot of lactic acid in?
There is not enough oxygen.
What are some functions that's cells perform in living things?
Obtaining oxygen, getting rid of wastes, obtaining food, and growing.
