Week 2 Handout(1)

Week 2 Handout(1) - TA: David Kakish...

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Unformatted text preview: TA: David Kakish tabild2@davidkakish.com Section B04: Wed 5:00‐5:50pm @ HSS 2154 Office Hours: Wed 4:00‐4:50pm @ Geisel 521 Week 2 Handout TISSUES Epithelial: Connective: Striated muscle: Smooth muscle: HOMEOSTASIS Define Homeostasis and indicate which of the above types of loops it utilizes. The _______________ maintenance of the _______________ environment _______________ feedback loops Controlled variables with larger variance in mammals: Controlled variables with smaller variance in mammals: TA: David Kakish tabild2@davidkakish.com Section B04: Wed 5:00‐5:50pm @ HSS 2154 Office Hours: Wed 4:00‐4:50pm @ Geisel 521 Components of a feedback loop: 1. 2. 3. Briefly describe or diagram what a negative feedback loop does and name an example that involves this type of loop. _______________ the effect of the original stimulus Examples: Briefly describe or diagram what a positive feedback loop does and name an example that involves this type of loop. _______________ the effect of the original stimulus TA: David Kakish tabild2@davidkakish.com Section B04: Wed 5:00‐5:50pm @ HSS 2154 Office Hours: Wed 4:00‐4:50pm @ Geisel 521 Examples: DIFFUSION & OSMOSIS Diffuse _______________ concentration gradient from _______________ concentration to _______________ concentration Which CAN diffuse across phospholipid bilayer? Charged ions Steroid hormones Fats Channels: Leak: Gated: Water Thyroid Hormones Protein Hormones Gases ( , Anesthetics Alcohol ) TA: David Kakish tabild2@davidkakish.com Section B04: Wed 5:00‐5:50pm @ HSS 2154 Office Hours: Wed 4:00‐4:50pm @ Geisel 521 Transporters: Aquaporins: Pores for _______________ to move across membranes Two types of water pressure: 1. Osmotic pressure a. Water moving _______________ its concentration gradient b. Water moves from _______________ solute concentration to _______________ solute concentration c. Water moves _______________ higher osmotic pressure 2. Hydrostatic pressure a. Pressure of _______________ hitting container walls b. Water moves _______________ from higher hydrostatic pressure The osmolarity of the cytoplasm is the same as that of a 0.9% NaCl solution. Fill in the table to indicate the properties of the solutions and the volume changes of the cells. Solution: 0.9% NaCl 0.2% NaCl 2.0% NaCl Osmolarity = Given that cell is Isotonic = Hypotonic = Hypertonic = Osmolarity (compared to cell’s contents): (higher, lower, same) Tonicity: (isotonic, hypertonic, hypotonic) Change in cell volume: (none, shrink, swell) ...
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