Catalyst part 1

Catalyst part 1On a sticky note write: How can the STERNGRR acronym be used to explain your lima bean experiment’s results?

• On the back put your vote for a class pet!

• Put your sticky note in the Parking Lot.

Quiz tomorrow on Scientific Method and STERNGRR

Know the following:-The cycle of the scientific method. (observe, assume, validate, conclude) and how each step correlates with those terms (ie: hypothesis is the assumption, procedure is the validation)- How to identify dependent and independent variables- What the acronym STERNGRR stands for and a brief explanation of each- How to classify something as biotic or abiotic

- Including the qualifications and characteristics (STERGRR plus cells/tissues/etc)

Catalyst part 2

1) What does it mean to be in balance?2) Why is it important to maintain

balance?3) Give an example of something in

your body that must remain balanced?

Answer in your composition or spiral note-book. You have 2 minutes.

Homeostasis{or maintaining the balance}http://www.youtube.com/watch?v=LTCDGzF7s54

Homeostasis literally means SAME STATE

• Homeostasis refers to the body’s constant struggle to keep all of the internal functions balanced• The endocrine (hormone) and nervous systems are

continually working to keep the body’s environment steady

DETERMINE THE BREATHING RATE OF YOUR PARTNER

Count for 15 seconds: _____* 4 = breaths per minute

Would you expect the rate to increase or decrease after exercise? Why or why not?

Breathing Lab

HAVE YOUR PARTNER DO JUMPING JACKS FOR 1 MINUTE

Re-measure their breathing rate.Count for 15 seconds: _____* 4 = breaths per minute

Would you expect the rate to increase or decrease after sitting for 3 minutes? Why or why not?

Breathing Lab

RE-MEASURE THEIR BREATHING RATE AFTER SITTING FOR 3 MINUTES

Count for 15 seconds: _____* 4 = breaths per minute

Breathing Lab

The Cell Membrane and Homeostasis

MUST maintain concentrations of:- Water - Wastes- Glucose - Salts-Nutrients

MUST maintain constant:- Temperature- pH- Glucose levels- Water balance

Homeostasis: refers to the body’s constant struggle to keep all of the internal functions balanced

Cell membrane: regulates what enters and leaves the cell and maintains homeostasis

Phospholipid bilayer: two layers of lipids that make a flexible barrier- Like “Red Rover”

selective-permeability: only some things can cross the membrane

Can Cross Can’t Cross

Small particles and water

Large molecules...they need help!

Fluid Mosaic StructureAllows molecules to move around easily in the lipid bilayer.Carbohydrates and proteins are embedded in the bilayer

Particles move in response to a concentration gradient:

Two categories of transport: Passive and Active

Passive Transport: a substance can move across the membrane with the concentration gradient without using energy/ATP

Active transport: Particles move from an area of low concentration to high concentration usingEnergy/ATP

Passive Transport

Facilitated diffusion (Facilitated= help/assist): Diffusion of particles with the help of a carrier protein or protein channel. Moves from high to low concentration.

Can be a protein channel (the particles just move through) or a carrier protein (changes shape to allow particles to fit through)

http://www.youtube.com/watch?v=YYdFixaYX3g&feature=endscreen

Osmosis: The diffusion of water from high to low concentration

Passive transport results in equilibrium when the gradient is balanced. Movement still continues but there is no net change in concentration.

Practice!

1. Which direction will the water move? __________________ What type of transport? _______________

2. Which way will the glucose molecules move across the membrane? Draw an arrow to show the movement. What type of transport is this? ___________________

3. Which of the following represents dynamic equilibrium?A. Water was 80% inside the cell and 80% outside the cellB. Protein was 30% inside the cell and 35% outside the cellC. Water was 85% inside the cell and 80% outside the cell

4. Fill out the chart to compare and contrast the types of PASSIVE TRANSPORT. Put an X in the box if the statement is true.

Diffusion Osmosis Facilitated Diffusion

Moves from HIGH to LOWNeeds a proteinNeeds energyMoves particlesMoves water

Catalyst

1. What is homeostasis?2. What are the three types of passive

transport? 3. What is the difference between

active and passive transport?

Quick Review

Any questions before the quiz?

Quiz• Complete your quiz silently. • When you have completed your test

silently finish your worksheet from yesterday.

• If you have finished that review your notes from yesterday.

Catalyst1. What type of transportation moves

particles from a high to low concentration?

2. What type of transportation moves water from a high to low concentration?

3. Why do the particles or water molecules move from a higher to a lower concentration?

Active Transport

Active transport: Particles move from an area of low concentration to high concentration usingEnergy/ATP

Active Transport: a substance can move across the membrane, AGAINST the concentration gradient with the help of ATP• LOW to HIGH concentration• Needs a PROTEIN CARRIER “pump”• Needs ATP (energy)

How is Passive Transport used in response to the environment?Hypotonic:

-hypo = less than usual- A hypotonic solution is one with

a lower concentration of solutes than the cell, and a higher

concentration of water.

How is Passive Transport used in response to the environment?Hypertonic:

-hyper = more than usual- A hypertonic solution is one with

a higher concentration of solutes and a lower concentration of water than the cell.

Let’s let somebody else explain it!

http://www.youtube.com/watch?v=_slUL3kMZlU&feature=related

Hypotonic SolutionOnly the water can move, what happens to the water level as it tries to reach homeostasis?

Hypertonic Solution

Only the water can move, what happens to the water level as it tries to reach homeostasis?

How does this affect cells?In animal cells…

In plant cells…

Practice!1. What type of transport will move the H+ ions

from low to high?

2. Freshwater protozoans, such as Paramecia, must constantly pump water out to keep from bursting. What does this tell you about the concentration of particles inside a Paramecium compared to the concentration of particles of its environment?

3. Fill in the table below to compare and contrast PASSIVE and ACTIVE transport. Place an X in the boxes that apply.

Diffusion Osmosis Facilitated Diffusion

Active Transport

Moves from HIGH to LOWMoves from LOW to HIGHNeeds a proteinNeeds energyMoves particlesMoves water

Movement across membranes can be

Which results in

Can be

which requires which requires

and a

In order to move particles from a region of

to a region of

The three types are…

They move particles from a region of

to a region of

Egg Demo

http://www.youtube.com/watch?v=SSS3EtKAzYc

Purpose: To investigate the effect of different solutions on an egg cellQuestion: Do egg cells gain or lose mass when an egg is placed in water and maple syrup?

Hypothesis: If an egg with the shell removed is placed in water, then it will _________________________________ ______________________________________ because ______________________________________. If an egg with the shell removed is placed in maple syrup, then it will __________________________________________________________________ because ______________________________________.

Results/Data

Questions for Analysis: 1) Were your hypotheses correct? Explain in 2-3 complete sentences:2) Draw a picture of what happened in both trials. Be sure to indicate WHAT moved WHERE!

• Water• Corn Syrup

3) What do you think would happen to the egg if it was placed in very salty water? Explain and draw a sketch:

• Salt Water

Check Yourself:1. If a particle is moving from high to low concentration, what type of transportation will it use?

2. If a particle is moving from low to high concentration, what type of transportation will it use?

3. If water is moving from hypertonic solution to a hypotonic solution, what type of transportation will it use?