Cells To Systems Chapter 2 1 Scott Foresman

Cells To Systems Chapter 2. 1 Scott Foresman

What are Cells? Smallest living part of a living thing. Have same needs as other organisms and carry out many of the same activities. Cells have parts inside them which help carry out activities

Cells and Their Functions Basic building blocks of life Unicellular Cells and Multicellular Cells How are cells like you? Cells take in food and get rid of waste Cells can grow and repair Sense and respond to changes in the environment Communicate and cooperate with other cells Need energy

How Cells Get energy Cellular Respiration: Take in food and oxygen release carbon dioxide water and energy

Parts of Cells Cell Membrane Cell membrane: Surrounds a cell and holds the parts together. Water, Sugar, and Oxygen allowed to enter, Carbon Dioxide and waste allowed to exit

Parts of a Cell Nucleus: Part of the cell containing chromosomes Chromosomes made from small sections of DNA= deoxyribonucleic acid shaped like a twisted ladder Heredity: process of passing genes from one generation to the next.

Parts of Cell Cytoplasm: All the material of the cell between the cell membrane and the nucleus. Mitochondria: cell’s power producers. Take in oxygen and food to produce energy Vacuoles: Act like stomach, store and break down material. In plants vacuoles also store water.

Activity Movement activity to remember parts of animal cells

Parts found only in a plant Cell Wall: Surrounds the cell membrane. Stiff to give plants extra support and protection Chloroplasts: Give plants green color. Use energy from sunlight to turn water and carbon dioxide into oxygen and sugar.

Size of Cells have a limit to size Cannot be too big, or oxygen and other material won’t be able to reach middle of cell fast enough to keep it alive. Too small and won’t have room for all their parts