Monday – 9/19 Imagine that there is a snail in your garden that is eating all of your plants. You have heard that pouring salt on a snail will kill it. On a sheet of loose-leaf paper, write 2-3 sentences explaining why or how you think the salt will kill the snail.

Set-up Lapbook

What do you think? 1.Why does your body involuntarily start to sweat when you’re too hot and shiver when you’re too cold? 2.What are some other things (besides temperature) that you think your body may need to regulate and keep balanced?

Homeostasis The process of maintaining a stable internal environment, even while the external environment is changing. A state of balance – equilibrium

Cell Transport A process that helps cells maintain homeostasis. It involves the movement of molecules across the cell membrane. Two types: Passive and Active

Cell Membrane Draw in the channel in some of the proteins. Draw in the carbohydrate chains. Label the items below on your cell membrane.

Cell Membrane The Cell Membrane’s key function is to regulate particles moving in and out of a cell. Small particles may move through the phospholipid bilayer, while other particles must pass through a transport protein. Identify the following: -Phospholipids -Proteins -Hydrophobic tails -Hydrophilic heads

Tuesday – 9/20 1.Describe each of the words below using a complete sentence for each word. Be sure to write down everything you remember! – Homeostasis – Cell Transport – Cell Membrane 2.In a complete sentence, explain how the terms above are related to one another.

Concentration Gradient The difference between the concentration of solutes in solutions. Natural flow is from high to low. (with the concentration gradient)

Passive Transport Process by which molecules move with their concentration gradient. Molecules move from high to low concentrations. Requires NO ENERGY.

Diffusion An example of passive transport in which molecules move from areas of high concentration to areas of low concentration until homeostasis is reached.

Facilitated Diffusion Diffusion with the assistance of a transport protein. Occurs when the molecule is too large or polar.

Exit Ticket 1.Which biomolecules are present in the cell membrane? 2.Do molecules naturally flow with or against a concentration gradient? 3.If you describe molecules as moving with the concentration gradient, which of the following means the same thing? a.Molecules move from a high to low concentration. b.Molecules move from a low to high concentration.

Wednesday – 9/21 This is for a grade: You must write a least half a page to get a passing grade!!!! Essential Question: On a loose leaf of paper. Explain how/why did the scented molecules in the balloon exited the balloon. You must use your academic vocabulary – homeostasis, diffusion, cell transport, passive transport, and concentration gradient - high to low.

Passive Transport – Osmosis Type of passive transport Process in which WATER molecules moving across a permeable membrane. H 2 Osmosis

How Does Osmosis Work? WATER always moves from the side with more water to the side with less water. In other words, water will always move to the side that has a higher concentration of solutes. Which side of the tube will the water rise?

Hypertonic Solution A solution that has LESS WATER than the cell. Will this cell swell, shrink, or stay the same?

Hypotonic Solution A solution that has MORE WATER than the cell. Will this cell to shrink, swell, or stay the same?

Isotonic Solution A solution that has the SAME AMOUNT of water as the cell. Will this cell to shrink, swell, or stay the same?

Side-by-Side Comparison

Stations You will cycle through 4 different stations. At each station, you will make observations and predications. Record your responses to each station on the handout.

How to do Osmosis predictions Write the steps next to the 3 small sticky notes on the passive transport side. 1.Draw a picture if one is not provided. 2.Identify the values that are given. 3.Calculate the percentage of water by subtracting the solute percentage from Identify where the water concentration is HIGHER. 5.Draw arrows going from high to low water concentration.

Which direction will water move across the plasma membrane? Will the cell shrink or swell? Cell/Plasma Membrane 98% Water 88% Water

Which direction will water move across the plasma membrane? Will the cell shrink or swell? Cell/Plasma Membrane 60% Water 75% Water

Which direction will water move across the plasma membrane? Will the cell shrink or swell? Cell/Plasma Membrane 50% Water 50% Water

Practice Makes Perfect! Complete the Part 1 Practice Problems to show your understanding so far!

Which direction will water move across the plasma membrane? Will the cell shrink or swell? Cell/Plasma Membrane 50% Solute 30% Solute HINT: Subtract the percent of salt from 100% to get the percent of WATER.

Practice Makes Perfect! Complete the Part 2 Practice Problems to show your understanding so far!

Solute, Solvent, Solution

Whiteboard Practice Draw the following on your whiteboard. A. B. C.

Back to Salt on a Snail Background Information: Snails are mainly composed of water. Snails have a layer of mucus that surrounds them that is composed mainly of water. Salt combines with the outer mucus layer. NOW, why do you think this kills the snail? Salt on a Snail Video

Exit Ticket Please grab you binder and your lapbook. Answer the warm-up on your sheet of loose-leaf paper below yesterday’s warm-up. What do you think would happen if you left saltwater fish in freshwater aquarium?

Friday – 9/23 Please grab your binder and your lapbook. Answer the warm-up on the same sheet of loose-leaf paper from yesterday. 1.Osmisis is always the movement of _______. 2.Describe was will happen to a cell that is left in the following solutions: A.Hypertonic: B.Hypotonic: C.Isotonic:

Recap – PASSIVE TRANSPORT 3 Characteristics HIGH TO LOW NO ENERGY WITH concentration gradient 3 Types Simple Diffusion: Movement of particles WITHOUT the assistance of a PROTEIN Facilitated Diffusion: Must be assisted by a PROTEIN Osmosis: Movement of WATER molecules ONLY

Naked Eggs and Osmosis

Egg Analysis WS Clear everything off your desk. Complete the Egg Analysis Exit Ticket without using your notes. 1.First, perform any necessary calculations so that you can draw the arrows in all 5 beakers at the bottom of your handout. HINT: Make sure you are paying attention to whether the values you are given are water or syrup concentrations. 2.Then, explain what is happening in the 3 beakers that are specified using the vocabulary words provided. When you finish, flip your exit ticket over.

Monday – 9/26 Please grab your binder and your lapbook. Answer the warm-up on a sheet of loose-leaf paper. 1.What are the 3 characteristics (rules) that apply to all types of passive transport? 2.What are the 2 types of passive transport that we discussed Friday? 3.How are the 2 types of passive transport different from each other? REMINDER I have tutoring today after school. Please be PROACTIVE and take care of business before it’s too late!

Recap – PASSIVE TRANSPORT 3 Characteristics HIGH TO LOW NO ENERGY WITH concentration gradient 3 Types Simple Diffusion: Movement of particles WITHOUT the assistance of a PROTEIN Facilitated Diffusion: Must be assisted by a PROTEIN Osmosis: Movement of WATER molecules ONLY

Active Transport Process by which particles move AGAINST their concentration gradient Movement from LOW TO HIGH concentrations Requires ENERGY

PASSIVE TRANSPORT: * NO ENERGY required * HIGH TO LOW * WITH con. gradient Examples: Diffusion Facilitated Diffusion Osmosis ACTIVE TRANSPORT: * ENERGY required * LOW TO HIGH * AGAINST con. gradient Examples: Endocytosis Exocytosis Sodium-Potassium pump ANALOGY: Passive vs. Active Transport

Active Transport 2 types of active transport: Endocytosis Exocytosis Can you figure out what each terms means?

Endocytosis Cell membrane folds inwards moving substances INTO the cell Receptor-mediated endocytosis: uptake of substances by the cell is targeted to a single type of substance that binds at the receptor on the external cell membrane Phagocytosis: the cell membrane surrounds the particle and pinches off to form an intracellular vacuole Pinocytosis: the cell membrane surrounds a small volume of fluid and pinches off, forming a vesicle

Exocytosis Exocytosis: a vesicle migrates to the cell membrane, binds, and releases its contents moving substances OUT of the cell

Sodium-Potassium Pump (Na +/ K + pump) Example of active transport. Naturally, Sodium (Na + ) and Postassium (K + ) ions diffuse across the cell membrane, WITH the concentration gradient, which DOES NOT require energy. The Na +/ K + pump reverses this process sending Na + ions out of the cell and K + ions into the cell AGAINST the concentration gradient, which REQUIRES energy (ATP). The Na + /K + pump was discovered in the 1950s by a Danish scientist, Jens Christian Skou, who was awarded a Nobel Prize in Would there be a need for Na +/ K + pump the Na + and K + ions were not continuously diffusing across the cell membrane? Why or why not?

Exit Ticket 1.List 3 characteristics of PASSIVE TRANSPORT. A.Energy Requirements B.High to Low or Low to High C.WITH or AGAINST concentration gradient 2.List 3 characteristics of ACTIVE TRANSPORT. A.Energy Requirements B.High to Low or Low to High C.WITH or AGAINST concentration gradient 3.Explain how the process described below includes both passive and active transport. A.Na + and K + ions are constantly diffusing across the cell membrane WITH the concentration gradient. B.The Sodium-Potassium pump uses a carrier protein to move Na + and K + ions back across the cell membrane AGAINST there concentration gradient.

Tuesday – 9/27 1. Describe the movement of the molecules in this picture. 2. Is this an example of ACTIVE or PASSIVE transport? 3. Does this process require energy? 4. What is the structure that is composed of phospholipids called? 5. What is the function of this structure? Please grab your binder and your lapbook. Answer the warm-up on your loose-leaf paper below yesterday’s warm-up.