100 likes | 251 Vues
Cells and Cellular Transport. S7L2a Explain that cells take in nutrients in order to grow and divide and to make needed materials. Characteristics of ALL Living Things. Cells Sensitivity to stimuli Growth Homeostasis (stable internal environment) Reproduction
E N D
Cells and Cellular Transport S7L2a Explain that cells take in nutrients in order to grow and divide and to make needed materials
Characteristics of ALL Living Things • Cells • Sensitivity to stimuli • Growth • Homeostasis (stable internal environment) • Reproduction • Metabolism (transformation and use of energy) • Adaptation
Cell Theory • The Cell is the basic structural and functional unit of all organisms. • Cell Theory states three things: • All living things are made of cells • All cells come from other living cells of the same kind • Cells are the basic unit of all living things
Transport of Cell Material • Passive transport –Molecules move through plasma membrane from areas of higher concentration to areas of lower concentration • Spontaneous • No energy required • Two types • Diffusion • Osmosis
Process by which substances move from areas of higher concentration to areas of lower concentration
Movement of water through a semi-permeable membrane from an area of high water concentration to an area of low water concentration • Semi-permeable means it prevents some molecules from crossing. Think of osmosis as the diffusion of water when only water can get through the semi-permeable membrane
Active Transport • Not spontaneous • Cell must use stored energy to move substances across the cell membrane in the opposite direction of concentration • Example • Using active transport, a cell will move dissolved substances from an area of lower concentration to an area of higher concentration • Opposite of diffusion, therefore requires energy
Exocytosis • Type of active transport in which materials are discharged out of a cell • Opposite is endocytosis, which is a type of active transport in which substances are imported INTO the cell.