Getting Into and Out of Cells Cell Transport Getting Into and Out of Cells

Types of Cell Transport Passive Transport - no cellular energy required to occur - goes with the concentration gradient Active Transport - requires cellular energy to occur - goes against the concentration gradient - Endocytosis/Exocytosis

Corner Move all the students into one corner and explain that they naturally want to have some space and when possible they will want to move to get that space.

Concentration Gradient The concentration gradient is the distribution of particles across space from high to low concentration

Passive Transport Energy for passive transport comes from the molecules themselves In passive transport, molecules move with the concentration gradient - move from high concentration to low concentration

Diffusion Primary means of cell transport - molecules move from high to low concentration - movement continues with the gradient until the molecules are evenly distributed - equilibrium is achieved

Facilitated Diffusion Particles move with the concentration gradient across a transport protein in the membrane - ions, sugar and amino acids all move into and out of cells by facilitated diffusion

Osmosis Is the diffusion of water through a membrane . If the concentration of water is higher outside a cell than inside, water moves into the cell. If the concentration of water is higher inside of a cell than outside, the water moves out of the cell.

Let me in Have students form into a circle representing the cell wall. Select the smallest students to be on the outside tell them this represents particles that need to move inside the cell representing passive transport. Then use teacher as example of active transport.

Active Transport Uses cellular energy/ ATP Goes against the concentration gradient - Low concentration to High concentration

Endocytosis Endocytosis – taking things into cells Phagocytosis- cell eating – takes in food Pinocytosis- cell drinking – takes in liquid - membrane encircles food or liquid, forming a vacuole White blood cell engulfing bacteria (bacillus)

Exocytosis Exocytosis-moving materials out of cells - wastes/ undigestible material - cellular products like: antibodies, hormones, enzymes and neurotransmitters -vacuole/vesicle containing the substance travels to the cell membrane where it fuses and releases it contents out of the cell

https://www.youtube.com/watch?v=ls_mdBQVGJ4

Mini Quiz Describe diffusion using real world examples, and why it is important to life functions Describe how passive transport works and how does the cell benefit from this? Why do plant leaves shrink, and how can this be remedied? Describe active transport, and why it is important. What are the differences between endocytosis and exocytosis, and why they are necessary? How does cell size and shape affect cell transport?