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Building blocks of life Lesson 2: year 7 life processes Living things are made up of tiny building blocks called cells. Each cell respires, takes in food, gets rid of wastes, grows, reproduces and dies. A living thing can be just one cell or millions of cells. Big living things don’t have bigger cells they just have more cells. Amazingly, the human body has more than 10,000,000,000,000 (that’s 10 million million) cells! Think about the size of your little toe. It has about 2 or 3 thousand million cells! That’s a lot of cells to make one toe, so cells must be very, very, very small. How do we know about cells if they are so small? Every living thing – from an elephant to an ant, from a tree to a daisy, from your left toe to right earlobe – is made of cells. Microscopes allow us to magnify cells revealing their shape and structure. This is a typical animal cell. Do animal and plant cells look the same? Compare a typical animal cell and a typical plant cell. Which parts of a plant cell are the same as an animal cell? Which parts of a plant cell are not found in an animal cell? What could you do if you were one cell? Not much! You’d be a blob, with lots of pieces floating around inside of you! Keeping you alive is a big job. So your body is made of millions of cells that have to be very organised. Your body has organs that each carry out specific jobs to keep you alive. How many organs can you name? Identify the organs labelled in the eye diagram. skin brain ear tongue heart lung stomach intestines muscle Similar Cells are cells the that building do the blocks sameofjob all livingtogether organisms. to Different tissues work together to work make an organ. make tissue. muscle cell stomach Different cells do different jobs. muscle tissue How do tissue, the millions cells and in your body workmake together? Muscle nerveoftissue blood tissue Muscle cells make muscle tissue. up the stomach. What type of cells are nerve tissue and blood tissue Organs work together to make an organ system. made from? What organ system is the stomach part of? Name a cell that would be suitable for each job.