Posted by Rajesh KC- November 10th, 2014 :
The human body is made up of billions of cells. Cells are the tiny building blocks of our tissues and organs. We all started life as a single cell. That cell made an internal copy of itself (replication) and then divided into 2 cells. Those 2 cells then also replicated and divided, so the 2 cells became 4 cells. The 4 cells replicated too and divided into 8 cells, and so on. Cells specialise to perform particular tasks. Some cells will cluster together to form a finger, for example. Others create skin and heal the skin when it is wounded. Cells get old and die after a certain amount of time (“programmed cell death”, or apoptosis), and replication ensures that new cells are made to take their place. When they are acting normally, cells “know” which other cells to join up with and stick to – and they also know when to stop replicating and die. Each type of cell has a particular role and set of knowledge or instructions in their DNA (genes). Our cells know how to make the right number of fingers on our hand for us (and they know that fingers should only grow on our hands). Each finger is covered with skin and each finger has a fingernail. If we cut our finger, the skin cells will start replicating and create new skin to heal the wound. If we lose a fingernail, our cells can grow a new one. But the cells will not create extra fingers, even if we lose one. The rules are clear for those cells, and they keep to the rules.
Monday, November 10, 2014
Popular Posts
-
Posted by Anup Baral May 28, 2015 : Watch a news report on Labor shortages to destroy Earthquake crack building in Kathmandu. Many people h...
-
Posted by Anup Baral November 22, 2015 : Vocal :Jyoti Magar &Tanka Timilsina Music :Bhadra Oli Lyrics :Naresh Rai Audio /Video :Rakshya...
-
Posted by Anup Baral: June 28, 2015: It is a unseen video footage of Michael Jackson’s hair catching on fire during the third take of a 1983...
-
Posted by Anup Baral September 27, 2015 : Ukali Orali is lok dohori program aired from Image Channel. Today’s episode is Phone call where yo...
-
Posted by Anup Baral December 02, 2015 : New Nepali Movie 2015/2072 Santan Ko Maya– Santanko Maya Starring – Rajesh Hamal,Dinesh Sharma, ...
-
Posted by Rajesh KC February 23, 2016 : Believing that news is for everyone and all the people have an equal right to receive true and factu...
-
Posted by Anup Baral March 04, 2015 : Posted by Anup Baral February 14, 2014 : The socio-economic status of women in Nepal is very poor. The...
-
Posted by Anup Baral April 20, 2015 : Don Ganesh Lama, who is official candidate of Madhesi Janaadhikar Forum-Democratic from Kavrepalanchow...
-
Posted by Anup Baral August 07, 2015 : Nanda, a domestic help, works in Siddharth and Arti's house. Nanda's friend warns her about S...
-
Posted by Anup Baral September 15, 2015 : Three policemen were injured in Bomb explodes at police station, Jhapa on Tuesday morning. The in...