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Catalyst part 1. Write a response to yesterday’s discussion on the achievement gap . How did you feel listen- ing to it? What implications will it have on your life? Have you ever had someone tell you that you couldn’t do something? What happened? What will happen now?. Binders by tomorrow

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slide1
Catalyst part 1

Write a response to yesterday’s discussion onthe achievement gap. How did you feel listen-ing to it? What implications will it have on your life? Have you ever had someone tell youthat you couldn’t do something? What happened? What will happen now?

slide2
Binders by tomorrow

Test grades and quiz retakes tomorrow

Quiz reaveraged

catalyst part 2
Catalyst part 2

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

What does it mean to be in balance?

Why is it important to maintain balance?

Give an example of something in your body that must remain balanced?

homeostasis

Homeostasis

{or maintaining the balance}

http://www.youtube.com/watch?v=LTCDGzF7s54

slide5
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
breathing lab
Breathing Lab

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 lab1
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 lab2
Breathing Lab

Re-measure their breathing rate after sitting for 3 minutes

  • Count for 15 seconds: _____* 4 = breaths per minute
the cell membrane and homeostasis
The Cell Membrane and Homeostasis

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

MUST maintain concentrations of:

- Water - Wastes

- Glucose - Salts

  • Nutrients

MUST maintain constant:

  • Temperature
  • pH

- Glucose levels

- Water balance

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

Phospholipid bilayer: two layers of lipidsthat make a flexible barrier

- Like “Red Rover”

slide15
Fluid Mosaic Structure

Allows molecules to move around easilyin the lipid bilayer.

Carbohydrates and proteins are embedded in the bilayer

slide17
Movement across membranes can be

Can be

which requires

which requires

and a

The three types are…

In order to move particles from a region of

They move particles from a region of

to a region of

to a region of

Which results in

two categories of transport passive and active
Two categories of transport: Passive and Active

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

Active transport: Particles move from an area of low concentration to high concentration using

Energy/ATP

passive transport diffusion
Passive Transport = Diffusion

https://www.youtube.com/watch?v=STLAJH7_zkY

= the movement of particles from a higher concentration to a lower concentration

slide22
Passive transport results in equilibrium when the gradient is balanced. Movement still continues but there is no net change in concentration.

Osmosis: The diffusion of water from high to low concentration

slide23
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

Facilitated diffusion (Facilitated= help/assist): Diffusion of particles with the help of a carrier protein or protein channel. Moves from high to low concentration. Still no energy usage.

practice
Practice!

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

slide25
2. Which way will the glucose molecules move across the membrane? Draw an arrow to show the movement. What type of transport is this? ___________________
slide26
3. Which of the following represents dynamic equilibrium?

A. Water was 80% inside the cell and 80% outside the cell

B. Protein was 30% inside the cell and 35% outside the cell

C. Water was 85% inside the cell and 80% outside the cell

slide27
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.
slide28
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)
practice1
Practice!

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?

slide31
3. Fill in the table below to compare and contrast PASSIVE and ACTIVE transport. Place an X in the boxes that apply.
check yourself
Check Yourself:

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

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

3. If water is moving from high to low, what type of transport will it use?

how does this affect cells
How does this affect cells?

In animal cells…

In plant cells…

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