Why Do Dogs Pant?

What do Humans do when we get hot? Why do we sweat?

So what’s the difference? Dogs Humans

What adaptations do humans have to help maintain balance in their bodies? You can write students responses using the smart board pens or on the dry erase board

Tougher than the Sun As you read the article, think about the following questions. What external factors did Josh's body have to balance?  What was Josh doing to cause this stress?  What symptoms did Maggie show that indicates her body is under stress?

What types of signals do our bodies give us that indicate our body is under stress? How does our body recover from this stress?

Think-Pair-Share Think Pair Share Come up with a list of 4 terms or concepts that relate to how organisms maintain balance. Pair Discuss your terms with your partner Share Be prepared to share your terms with the class

Egg-sellent Experiment Let’s pretend this egg is a single cell in our body The shell has been removed to expose the semi-permeable membrane beneath This means some stuff can get through while other stuff cannot

Now we are going to put these shell-less eggs in a few different solutions. Distilled water No liquid Corn syrup

Massfinal - Massinitial Change in Mass÷Initial mass x 100 Collecting Data Type of Liquid Initial Mass (g) Initial Observations Final Mass (g) Final Observations Change in Mass Massfinal - Massinitial % Change in Mass Change in Mass÷Initial mass x 100 Egg in Distilled Water   Egg in Corn Syrup Egg in Empty beaker

Qualitative vs. Quantitative Which data is considered quaNtitative? Which data is considered quaLitative?

Variables Independent Dependent Control

Groups Experimental Control

Hypotheses What will happen to the egg when placed in the different solutions? If I place a shell-less egg in distilled water then its mass will _____________. If I place a shell-less egg in corn syrup then its mass will _____________. If I place a shell-less egg in an empty beaker then its mass will _____________.

Draw a Diagram of your Prediction Distilled water After 1 Day Empty Beaker After 1 Day Corn Syrup After 1 Day

Before you get your egg… You must be CAREFUL The eggs are very FRAGILE and can break Only use slotted spoon to move egg We do not have extra eggs if one breaks

Safety Or else…. Raw eggs carry SALMONELLA If ingested, it will cause you to becomes very sick Diarrhea Vomit Stomach pain You must wash hands after lab Or else….

Data Analysis Describe what happened to your egg. Why do you think that happened? If our cells are similar to the egg, what would happen if we only drank very sugary drinks (like the corn syrup)? Why?

Tonicity

Vocabulary Solute: particles in a solution like salt or sugar Solvent: usually a liquid which dissolves solutes like water Solution: A mixture of solutes and solvent Concentration: How much solute is in a solution

Hypertonic Outside Higher concentration of solute _________ the cell. The cell is __________ The solution is __________ Water moves _____ of the cell. The cell __________. Outside = solute Hypotonic Hypertonic out shrinks

Hypotonic Inside Higher concentration of solute _________ the cell. The cell is __________ The solution is __________ Water moves _____ of the cell. The cell __________. Inside = solute Hypertonic Hypotonic in grows

Isotonic ________ concentration of solute inside and outside. The cell and solution are ____________ Water moves ____ and ____ of the cell at the same rate. The cell stays the ________. Same Isotonic In out Same

C.E.R. Claim Evidence Reasoning If you place a shell less egg in ___________, it will _____________ in mass. Evidence The mass of my egg ______________ by _________ grams Reasoning ________________ is a _________________ solution. Water will flow ________________ the egg making it________________