Day Four Agenda:  Review Transport Classwork  Surface Area-Volume (SA-V) Ratio Review  SA-V Notes  Group Lab Activity  Exit Ticket

Standards: Describe the impact of surface area to volume ratio on cell division, material transport, and other life processes. Bio 3e.

Target: I will describe the relationship between a cell’s external solute concentration and its effect on the cell’s internal solute concentration.

Warm up: A. Fluid mosaic model B. Osmosis C. Selective permeability D. Phospholipid E. Homeostasis 1.Another word meaning balance or equilibrium 2.Process of moving water molecules from an area of greater water concentration/pressure to an area of lesser water concentration/pressure. 3.Term meaning only certain molecules or substances can permeate (get through) the membrane 4.Term used to describe the membrane due to its many pieces working together yet it is allowed to move and flex. 5.Not an organelle, but it is a structural lipid that has one or more phosphate groups attached to it, which forms most biological membranes.

In the diagrams below, label the side with the high concentration (HIGH) and the low concentration (LOW). Then draw and arrow (  ) showing the direction the solutes will move through the membrane. Today’s target: I will describe processes associated with movement across the membrane for diffusion, facilitated diffusion, osmosis, and active transport and the relationship between a cell’s external solute concentration and its effect on the cell’s internal solute concentration.  Cell Membrane Transport Active Transport Practice

In the diagrams below, label the side with the high concentration (HIGH) and the low concentration (LOW). Then draw and arrow (  ) showing the direction the solutes will move through the membrane. Today’s target: I will describe processes associated with movement across the membrane for diffusion, facilitated diffusion, osmosis, and active transport and the relationship between a cell’s external solute concentration and its effect on the cell’s internal solute concentration.  Cell Membrane Transport Diffusion Practice

Today’s target: I will describe processes associated with movement across the membrane for diffusion, facilitated diffusion, osmosis, and active transport and the relationship between a cell’s external solute concentration and its effect on the cell’s internal solute concentration.  Cell Membrane Transport Active Transport Practice What will happen to the cell if placed in a hypertonic solution? shrink/swell What will happen to the cell if placed in a hypotonic solution? shrink/swell Active transport which moves materials into the cell? endocytosis/ exocytosis Active transport which moves materials out of the cell? endocytosis/ exocytosis

Today’s target: I will compare the efficiency of the ability of a cell to transport material based on surface area to volume ratios.  Cell Membrane SA-V Introduction To consider … If you were in a classroom vs. a stadium, what would be easier to leave? What are some benefits to being small vs. being large?

Today’s target: I will compare the efficiency of the ability of a cell to transport material based on surface area to volume ratios.  Cell Membrane SA-V Videos tructure-of-a-cell/prokaryotic-and-eukaryotic- cells/v/cell-size Why does it benefit a cell to have a high surface-area to volume ratio?

Today’s target: I will compare the efficiency of the ability of a cell to transport material based on surface area to volume ratios.  Cell Membrane SA-V Videos Why does it benefit a cell to have a high surface-area to volume ratio? Cells are limited by their need to exchange resources with their environment.

Today’s target: I will compare the efficiency of the ability of a cell to transport material based on surface area to volume ratios.  Cell Membrane SA-V Notes As cells increase in size, surface area to volume ratios decrease, making cells unable to obtain nutrients or remove wastes. To reduce the effects of this, cells divide to stay small or change shape to increase surface area or reduce volume.

Today’s target: I will compare the efficiency of the ability of a cell to transport material based on surface area to volume ratios.  Cell Membrane SA-V Videos What is surface area? The sum of all the areas of all the shapes that cover the surface of the object.

Today’s target: I will compare the efficiency of the ability of a cell to transport material based on surface area to volume ratios.  Cell Membrane SA-V Videos What is volume? The amount of space that a substance or object occupies.

Today’s target: I will compare the efficiency of the ability of a cell to transport material based on surface area to volume ratios.  Cell Membrane SA-V Videos What is surface area to volume ratio? Volume increases faster than surface area. The surface area and volume both increase … but, not at the same rate.

Today’s target: I will compare the efficiency of the ability of a cell to transport material based on surface area to volume ratios.  Cell Membrane SA-V Notes

Today’s target: I will compare the efficiency of the ability of a cell to transport material based on surface area to volume ratios.  Cell Membrane SA-V Notes

Today’s target: I will compare the efficiency of the ability of a cell to transport material based on surface area to volume ratios.  Cell Membrane SA-V Notes In summary … As the length of a side increases volume will increase at a faster rate than surface area because volume is three dimensional and area is two dimensional.

Today’s target: I will compare the efficiency of the ability of a cell to transport material based on surface area to volume ratios.  Cell Membrane SA-V Notes

Hypothesis #1 What will happen to the surface area-to volume ratio that occurs as the volume of the cube increases? The surface area to volume ratio (dependent variable) will _____________ as the volume of the cube (independent variable) increases. a)Increase b)Decrease c)Remain the same

Hypothesis #2 What happens to the rate of diffusion when the volume of the cube increases? The rate of diffusion (dependent variable) will __________ as the volume of the cube (independent variable) increases. a)Increases b)Decreases c)Remains the same