“Nothing will work unless you do.” ~ Maya Angelou

Tuesday, October 8, 2013

S.C. Standards for Today: B-2: The student will demonstrate an understanding of the structure and function of cells and their organelles.Today’s Objectives:• Cell Rubric• Finish Egg Osmometer Lab• Discuss Active Transport• Create a Mind Map on the different types of transport

Reminder: Cell Project Due 10/16/13!

Warm Up:

1. What are the three types of passive transport?

2. What is the function of the lysosome?

3. What happened to your jar full of beans and sand?

Active Transport

Active Transport• Transport of molecules against a concentration

gradient (from regions of low concentration to regions of high concentration) with the aid of proteins in the cell membrane and energy from ATP

Cell Membrane Pumps

• Carrier proteins move substances from low concentration to a higher concentration

Ex: Sodium-Potassium Pump• 2 Na+ pumped out of the cell• 2K+ pumped into the cell

Sodium Potassium Pump

Endocytosis• Importing larger quantities of

materials by infoldings of the cell membrane• Phagocytosis: “cell eating”• Cell membrane surrounds the food and

buds off a vacuole. Lysosomes then secrete enzymes into a vacuole to digest food

Endocytosis

Endocytosis

• Importing larger quantities of materials by infoldings of the cell membrane• Pinocytosis: “cell drinking”• Smaller infoldings allows droplets of liquid

to enter

Exocytosis

• Large quantities of substances exiting the cell• Dumping of excretions or wastes outside• Secretion of products needed elsewhere

(example: new proteins, hormones, etc.)

Exocytosis

Active Transport

Summary of Transport

Method Energy Required?

Molecules Concentration Gradient

Passive Transport

No Very Small Down

Active Transport

Yes Small/Large Up

Transp

ort

Min

d-

Map

• Create a mind map using the following words: • Endocytosis• Fusion of vesicle to plasma

membrane• Pinocytosis• Facilitated Diffusion • Simple Diffusion• Hypertonic • Goes against gradient• Movement directly thru

membrane• Non-polar and small polar

substances• Uses transport proteins• Movement of water through a

semi-permeable membrane

• Isotonic• Active• Phagocytosis• Solids• Liquids• Exocytosis• Na/K pump• Requires ATP• Osmosis• Passive• Formation of vesicles from

plasma membrane• Hypotonic