1. 4pics1word: What word do these four pictures have in common?
Bellwork Day 5
BALANCE
This bellwork slide is based of the app game 4pics1word, where you will be shown a screen with four photographs. These four photographs each have something in common, the actual game provides the hint of how many letters the word contains and a word jumble. The bellwork here does not include those options.
Explain to students that ALL cells must complete certain processes to maintain a balance. Ask students to provide synonyms for balance/balanced. (stability, equilibrium/equal, steady)
Explain to students that in science we refer to balance as HOMEOSTASIS and that to maintain balance certain process need to occur in each cell. (Topic for today)
4pics1word: What word do these four pictures have in common?

2. Allow students an opportunity to process the connection of balance and homeostasis. (#1 and 2 on their notes sheet)
Video will play from 19 sec - 53 sec mark.

3. How many examples of homeostasis can you come up with in a minute?
As a group -
How many examples of homeostasis can you come up with in a minute?
Allow students to brainstorm as a group with a post - it throwdown.
Popcorn around the room to share student thoughts.

4. Video will play from 52 sec to 1min 56 sec mark.

5. Why do you think your body would benefit from maintaining homeostasis?
Think Pair Share (Turn and Talk)

6. Which part of a cell do you think is most responsible for helping maintain homeostasis?

7. Video will play from 2min sec to 3min 46 sec mark. (Answer to #3 - #5)

8. Explain why the cell membrane plays an important role in maintaining homeostasis in a cell.
(Answer to #5 in student notes) They should discuss this.

9. We may know what homeostasis is, but...
What is the purpose of homeostasis?
Lead a short class discussion using response chaining.
You should hear mention of balance and keeping things even.
Yes, this is the general answer but dig for more specific answers. The balance of what? What is the body trying to maintain?

10. The purpose of Homeostasis is to …
Obtain and use energy
Make new cells
Exchange material (such as nutrients)
Eliminate waste
(Answer to #6 on student notes)

11. Why do all organisms need homeostasis?

12. ALL living organisms have/need homeostasis because they all have cell membranes
homeostasis allows cells to reproduce, get energy, nutrients & remove waste.
(Answer to #7 on student notes)

13. How do plants get energy? How do animals get energy?
Think Pair Share (Turn and Talk)
Probe for students responses to include the process of photosynthesis.
Address the following misconception: believe that plant and animal cells obtain their nutrients (food) from the environment.

15. What do you think the term Cellular Respiration means?
Use Response Chaining or Whip strategy for students to discuss.

16. (Answer to #8 on student notes)
Address the following misconception: believe that respiration occurs in the lungs and is solely the process of gas exchange.

17. How do you think plants maintain homeostasis?

18. Discuss what happens if the plant receives too much water or not enough…
What happens to plant when there is no sun? How do they maintain homeostasis without light? (next slide - Cellular Respiration)

19. Plants maintain homeostasis by Photosynthesis & Cellular Respiration
(Answer to #9 on student notes)
Plants maintain homeostasis by
Photosynthesis & Cellular Respiration

20. Cellular Respiration occurs in the MITOCHONDRIA of
ALL EUKARYOTIC CELLS.
(Answer to #10 of student notes)

21. The survival of a cell depends on the cell maintaining homeostasis
The survival of a cell depends on the cell maintaining homeostasis. What is most likely to happen to a cell if homeostasis is not maintained?
The cell will immediately divide.
Cell processes will continue unchanged.
The cell will eliminate wastes more efficiently.
Many reactions in the cell will slow down or even stop.

22. Remaining slides are for Advanced Day 6

23. How does your body know what to do?
The basic unit of life is the cell.
This means that this balance is being maintained at a cellular level and the cells in your body communicate with each other.
Each cell in your body has a function and they rely on each other to obtain the substances needed to function and help remove waste products.
Images:
LuMaxArt, (CC BY-SA 2.0)
OpenStax, (CC BY 4.0)

24. How do your cells take in and remove substances?
The cells use a variety of ways to bring in and remove substances depending on the situation.
To understand the processes we need to define a few more words.
Image: Mariana Ruiz, (CC0)

25. Terms that refers to internal and external conditions.
Concentration is the amount of solute dissolved in a given amount of solvent.
Or how much stuff is in something.
Image: FirstPrinciples, (CC0)

26. Concentration Gradient
A concentration gradient is a condition that exists when there is a difference in the concentration of a substance across a space. (higher and lower areas of concentration)
One side has more stuff in it than the other side.
Image: Quasar Jarosz, (CC0)

27. Equilibrium
Equilibrium is a condition that exists when there is an equal concentration of a substance across a space.
Each side has the same amount of stuff.
Image: Quasar Jarosz, (CC0)

28. Semi-permeable membrane
In a cell this “space” is usually a semi-permeable membrane that allows some things to pass through and blocks others.
Kind of like a guard. Only lets in the right stuff.
Image: Freemesm, (CC BY-SA 3.0)

29. Methods of bringing in and removing substances with no energy.
Passive transport is the movement of substances into or out of the cell from an area of higher concentration to a lower concentration without the use of energy.
If there is more stuff outside the cell than inside, some of the stuff moves into the cell. It is easy, doesn't need any energy.

30. Methods of bringing in and removing substances with no energy: Diffusion
Diffusion is a type of passive transport where particles move from an area of higher concentration to an area of lower concentration.
Stuff moves from where it is crowded to where there is more room.
Images:
Quasar Jarosz, (CC0)
Rlawson, (CC BY-SA 3.0)

31. Methods of bringing in and removing substances with no energy: Osmosis
Osmosis is the diffusion of water (a solvent) from an area of lower solute concentration to an area of higher solute concentration through a semi-permeable membrane.
Water (not stuff) moves from where there is less stuff to where there is more stuff.
Rlawson, (CC BY-SA 3.0)

32. Methods of bringing in and removing substances with no energy: Facilitated diffusion
Facilitated diffusion is the movement of larger particles from an area of higher concentration to an area of lower concentration with the use of carrier molecules (proteins that help a substance across a membrane).
Stuff that is too big to get through the normal goes through a special door that has to be held open by a special guard. It is still moving from where there is more stuff to where there is less stuff.
Image: LadyofHats, (CC0)

33. Methods of bringing in and removing substances with energy.
Active transport is the movement of substances into or out of the cell which requires the use of energy.
Stuff gets in to (or out of) the cell but the cells needs to use energy to do this.

34. Now what?
As a group you are going to put an example and a diagram on each of your vocabulary cards.
Then you are going to work together, using your vocabulary cards, as a cell to maintain homeostasis during several environmental scenarios.