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Cells Cell is the basic building block that makes up all living things Cell Functions Take in food to store energy Get rid of body wastes Make new cells for growth Release energy Respond to the environment Plant Cell cell membrane chloroplasts cell wall vacuole mitochondria cytoplasm nucleus Animal Cell VACUOLE MITOCHONDRIA Cell MEMBRANE NUCLEUS CYTOPLASM Cell Parts and Functions Cell Membrane Surrounds the cell to help hold it together Allows materials to move in and out Works like a gate in a walled city PICTURE OF A REAL CELL MEMBRANE It has been magnified so that we can see it! Nucleus Contains the chromosomes (DNA) which determines the characteristics Controls cell reproduction and other functions Like a king controlling his city Nucleus seen in a human cheek cell Cytoplasm Found between the cell membrane and nucleus Jellylike substance containing chemicals to keep the cell working Like the space/air that fills the walled city Mitochondria Releases energy from food Like a power plant producing energy for the city Vacuoles Used for storage Stores food, waste, or water Like a water tower or a garbage dump for the city Cell Wall (Plants Only) Outside cell membrane Rigid layer that supports and protects the plant cell Like a wall surrounding the city The cell walls of these onion skin cells can be seen in the photograph below. Chloroplasts (Plants Only) Makes food for the plant Like a restaurant or cell Uses sun energy to make food (glucose) and oxygen bakery in the city An Elodea leaf magnified 400X. The numerous green structures are chloroplasts. The Parts of a Cell Cell Membrane Cytoplasm Chloroplast Cell Wall Vacuole Mitochondria Nucleus The Size of Cells • Cells have a limit to how big or small they can be. The head of a pin is about 2mm in diameter. A cell is even smaller. Nearly invisible without magnification, dust mites dwarf pollen grains and human cells. In turn, bacteria and viruses are even smaller. How Big is a Cell? cell membrane surrounds cell-holds it together allows materials to pass in & out of cell cell basic building block that makes up all living things cytoplasm between cell membrane & nucleus chloroplast •found in plant cells •uses Sun’s energy to make food (sugar) & oxygen cell wall found in plants outside the cell membrane gives extra support & protection vacuole stores H20 & breaks down materials mitochondria produce energy by cellular respiration cytoplasm cell membrane mitochondria chloroplast cell wall vacuole The skin on the Barbie doll is like the cell membrane of a cell because both are outside surfaces, and allow substances to pass in and out of the cell. Cell Analogy Project Edible Animal Cell cell membrane = Jello = 2 raisins = 1 pear = 2 peaches = plastic bag cytoplasm mitochondria nucleus vacuoles