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7A Cells. 7A Cells. Signs of life. Building blocks of life. Building living things. 7A Cells. Signs of life. 7A Signs of life - Life on Mars?. 7A Signs of life - Life on Mars?. Serious efforts to discover life on other planets have been going on for many years.
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7A Cells 7A Cells Signs of life Building blocks of life Building living things
7A Cells Signs of life
7A Signs of life - Life on Mars? Serious efforts to discover life on other planets have been going on for many years. A simple way of sorting everything on our planet is to divide it into 2 groups – living things and non-living things. But can you tell the difference? If extra-terrestrial beings really were discovered how would scientists decide if they were alive?
7A Signs of life – The meaning of life There are seven essential life processes. To remember these processes meet our little blue woman MS. R. NERG… What do all the letters in her name stand for?
7A Signs of life - The meaning of life M = MOVEMENT Living things are able to move about. Animals move from place to place. Plants move by responding to light. S = SENSITIVITY Living things notice and react to changes in their surroundings. They can respond to light,heat, sound, taste, sight or touch. R = RESPIRATION Living things need energy to carry out the functions that keep them alive. Respiration is the process by which food is turned into energy.
7A Signs of life - The meaning of life N = NUTRITION Living things need to take in food so thatrespiration can occur. Nutrients in food helpto build, maintain and repair the organism. E = EXCRETION Living things have to get rid of unwanted wasteproducts. R = REPRODUCTION Living things produce offspring. Reproductioncontinues the survival of each species. G = GROWTH Living things grow, increasing in size and complexity.
7A Signs of life - The meaning of life All living things carry out the seven essential life processes. M S R N E R G = Movement = Sensitivity = Respiration = Nutrition = Excretion = Reproduction = Growth But what are living things made of?
7A Cells Building blocks of life
7A Building blocks of life - Cell fact file Living things are made up of tiny building blocks called cells. Each cell breathes, 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.
7A Building blocks of life - Cell fact file 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?
7A Building blocks of life - Cell-ebrate the Microscope Cells could not have been discovered without the invention of the microscope. “micro-” means” small”, “-scope” means “looking at”. A microscope allows us to look at very small things by making them seem bigger. It magnifies tiny details and makes them visible to the human eye.
7A Building blocks of life - Cell-ebrate the Microscope Cell-ebrate the microscope!
7A Building blocks of life - Cell-ebrate the microscope 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?
7A Building blocks of life - Typical cells 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?
7A Cells Building living things
7A Building living things - Cells working together Keeping you alive is a big job. So your body is made of millions of cells that have to be very organised. Not much! You’d be a blob, with lots of pieces floating around inside of you! Your body has organsthat each carry out specific jobs to keep you alive. How many organs can you name? What could you do if you were one cell?
7A Building living things - Cells, tissues and organs Identify the organs labelled in the diagram. brain eye ear tongue heart skin lung stomach intestines muscle
7A Building living things - Cells, tissues and organs Similarcells that do the same job work together to make tissue. Muscle cells make muscle tissue. What type of cells are nerve tissue and blood tissue made from? Differenttissueswork together to make an organ. Muscle tissue, nerve tissue and blood tissue make up the stomach. Organs work together to make an organ system. What organ system is the stomach part of? Cellsare the building blocks of all living organisms. Different cells do different jobs. How do the millions of cells in your body work together? muscle cell stomach muscle tissue
7A Building living things - Different cells for different jobs Name a cell that would be suitable for each job.
7A Building living things - How are new cells made? All living things (including you and your teacher) started as one tiny cell! Living things grow and repair themselves by an amazing process called cell division. So where do all the cells come from?
