Post on 16-Jan-2017
Structure and Function of Cells: Structure and Function of Cells: Cellular TransportCellular Transport
All About YouTeacher Education Course
2013-2014
Key Take-Away and Unifying Themes Key Take-Away
• We will write it at the end of this lesson
Objectives• Explain why cellular transport is important• Identify the parts of a solution and what affects
concentration• Determine movement of substances across a cell
membrane by comparing concentrations in- and outside the cell
• Use data to describe how cellular transport affects efficient cell size
What do cells need to do to survive?Metabolism
• includes chemical reactions that convert energy from food to energy for life processes, like moving, repairing, and growing
• cells take in essential materials such as oxygen and glucose, a food source for cells
• cells get rid of waste such as carbon dioxide and lactic acid, a waste product from when a cell breaks down food with little oxygen
• many substances, like water, flow into and out of the cell
Cellular TransportIn order to undergo metabolism, a cell must undergo cellular transport
• constant flow of materials into and out of cells through the cell membrane, or the semi-permeable outer covering of the cell
A B C
ConcentrationLook at the first scenario and predict the outcome of the
second scenario:
ConcentrationLook at the first scenario again and predict the outcome
of this third scenario:
Concentration A solution is made up of two
parts: solute and solvent
The concentration of a solution indicates the amount of solute dissolved in a solvent
Consider the image on the right•What is the solution?•What is the solvent?•What is the solute?•Which cup has the highest concentration?•Which cup has the lowest concentration?
Active and Passive Transport Materials can move into and out of a cell with the
use of energy (active transport) or without the use of energy (passive transport)
Whether the cell uses active or passive transport depends on the concentration gradient, or the concentration of the substances outside of the cell (extracellular environment) compared to the concentration of the substances inside the cell (intracellular environment)
Active and Passive Transport Equilibrium occurs when the concentration of the
solute in the extracellular environment is balanced with the concentration of the solute in the intracellular environment
Equilibrium is reached in passive transport
Equilibrium is not reached in active transport
Active and Passive Transport
Diffusion and OsmosisDiffusion is a type of
passive transport where the substances move from an area of high concentration to an area of low concentration
Osmosis is the term used for the diffusion of water across a cell membrane
ActivityActivity background
ActivityHow does cellular transport affect efficient cell size?
Key Take-Away and Unifying Themes What is the key take-away of this lesson?
How does this lesson relate to• The characteristics of life?• Form fits function?• Homeostasis?