You need: Clean paper (2) / Pencil Warm Up: Mental Math – be ready I CAN: demonstrate knowledge of the parts, functions, and interactions of the body systems. Feb.14, 2018

Homeostasis Homeo…homoios, homo -Greek -means “like” or “same/similar” Stasis… -English -means a period of inactivity or balance

Egg Observations When I say “egg” – what do you imagine in your head? Write that down. Is this what you imagined…why or why not? How do they compare/contrast? Let’s talk about why…and hypothesize. After they write observations/prior knowledge of “chicken egg” – I show the egg with no shell. They write observations again. I explain what I have done. They hypothesize about what happened and why. I am careful to talk about the calcium carbonate of the shell is similar to the calcium bones need. It is used for protection for the egg. Calcium carbonate happens to be a base – so it reacts and dissolves when add to an acid like vinegar. I intentionally made them react to dissolve the egg shell. Last question – if the shell is gone, why is it not a blob that slips through my fingers? How does it hold it’s shape? Students should eventually – through hypotheses and/or prior knowledge and experience – realize that the egg has a “thin skin” or membrane in addition to the shell. A membrane like a cell!

Observations of an egg Observations of “de-shelled” egg

Check your chart 89.8g 90.3g 94.6g 91.7g 88.9g 91.7g 89.0g 89.3g 93.1g Soaking liquid Initial Mass Hypothesis Mass after soak Net change Observations No liquid water Corn syrup Paint Food color 89.8g 90.3g 94.6g 91.7g 88.9g 91.7g 89.0g 89.3g 93.1g 84.0g

Egg Observations Let’s take it to the next level… What if we put the egg into different solutions like water?...corn syrup?...blue water? Write out the chart we have started and add in your hypotheses. At this point, we “demo” the addition of an egg to each solution…but we need a comparison – so we maintain a control. The water and syrup look alike – but how are they different? (Viscosity or thickness) The blue food coloring and blue water color (paint) is interesting in that they look very similar to each other and could confuse the folks running the experiment. We have already taken some measurements – like initial mass of each egg. If we are making scientific observations, the expectation is that we will record observations and be sure to include measurements WITH UNITS!!! Next – we sit and wait for eggs to change (and that will work best if done overnight – so let the kids relax and move to another activity such as cell 4x16 vocabulary.

Check your chart 84.1g 75.0g 86.5g 81.2g 85.2g 87.7g 75.6g 83.3g 89.5g Soaking liquid Initial Mass Hypothesis Mass after soak Net change Observations No liquid water Corn syrup Paint Food color 84.1g 75.0g 86.5g 81.2g 85.2g 87.7g 75.6g 83.3g 89.5g 86.7g

Check your chart Mass 84.1g 83.9g 75.0g 70.0g 86.5g 92.0g 81.2g 86.9g Soaking liquid Initial Mass Hypothesis Mass after soak Net change Observations No liquid water Corn syrup Paint Food color 84.1g Mass 83.9g -0.2 g 75.0g 70.0g -5.0 g 86.5g 92.0g +5.5 g 81.2g 86.9g +5.7 g 85.2g 67.0g -18.2 g 87.7g 67.2g -20.5 g 75.6g 79.1g +3.5g +7.2g 83.3g 90.5g 89.5g 95.3g +5.8g 86.7g 93.5g +6.8g

Did the mass increase or decrease? What does that tell us?

CELLS Even if cells are very tiny, they are made up of smaller parts, and the parts do different jobs. Cell membrane Nucleus

Osmosis – “osmos” is Greek…to push Movement of WATER through a semi-permeable membrane…for balance. Diffusion – mvmt of particles

Cells Page 286 Skim through the reading. Write a sentence (or two) explaining the difference between PROKARYOTIC and EUKARYOTIC

Today Complete at least page one and two (front back of one paper) in the cell identification. Read for understanding (it’s okay to make annotations). Color for association (follow directions).