Describe a sentence what happens to individual cells when an organism grows. reproduces, or repairs damages.
^^i dont get this question its for science
2006-09-12 09:40:02 · 3 answers · asked by Anonymous in Science & Mathematics ➔ Other - Science
Most human cells are frequently reproduced and replaced during the life of an individual. However, the process varies with the kind of cell. Somatic, or body cells, such as those that make up skin, hair, and muscle, are duplicated by mitosis. The sex cells, sperm and ova, are produced by meiosis in special tissues of male testes and female ovaries . Since the vast majority of our cells are somatic, mitosis is the most common form of cell replication.
The cell division process that produces new cells for growth, repair, and the general replacement of older cells is called mitosis. In this process, a somatic cell divides into two complete new cells that are identical to the original one. Human somatic cells go through the 6 phases of mitosis in 1/2 to 1 1/2 hours, depending on the kind of tissue being duplicated.
Some human somatic cells are frequently replaced by new ones and other cells are rarely duplicated. Hair, skin, and fingernails are replaced constantly and at a rapid rate throughout our lives. In contrast, brain and nerve cells in the central nervous system are rarely produced after we are a few months old. Subsequently, if they are destroyed later, the loss is usually permanent, as in the case of paraplegics. Liver cells usually do not reproduce after an individual has finished growing and are not replaced except when there is an injury. Red blood cells are also somewhat of an exception. While they are being constantly produced in our bone marrow, the specialized cells from which they come do not have nuclei nor do the red blood cells themselves.
2006-09-12 09:45:35 · answer #1 · answered by Anonymous · 0⤊ 1⤋
Alyssa, you are going to HAVE to do your own homework, using your own books, which explain all this at a level appropriate to your grade level. It will require you to sit somewhere away from your computer, but with your book open. You may have to read the chapter several times to get the meaning thoroughly, but having other people string the words together for you is going to impede your learning and insure that you do not pass the exam.
2006-09-12 16:49:50 · answer #2 · answered by finaldx 7 · 0⤊ 1⤋
The cells devide and reprduce themselvse!!! I hope this single sentence helps you.
2006-09-12 16:47:42 · answer #3 · answered by joey 2 · 0⤊ 1⤋