Biology 347 - General Physiology Lab - Stark and Kumar - Fall 2004
Quiz 4 - Postquiz on Electrolyte Interactive Physiology and Prequiz on Heart, 10/21/04

1. Why should you take someone's pulse using your fingertips rather than your thumb?

There is a huge pulse in your thumb which is why we monitor it there

2. Why are lipids not dissolved by water?

water is a polar solvent

3. If the SA node fails to trigger atrial excitation, the AV node, whose automaticity is slower, will eventually kick in. What would be conspicuously missing in the EKG?

P would be missing

4. What would happen to a red blood cell placed in distilled water?

swell and burst

5. You take note of the reading as you notice the last Korotkoff sound. What is this reading?

diastolic pressure

6. The answer to one of your worksheet questions was "Potassium can diffuse quickly, while sodium diffuses slowly." Why? (It seems odd since K+ has a higher atomic weight than Na+.)

Since Na+ charge is more concentrated, it attracts a greater shell of water

7. Apnea (breath holding) would do what to the peripheral pulse monitor reading?

decreases peripheral pulse

8. Absence of what hormone would make an adrenalectomized rat crave salt?


9. Exactly what measurements do you need to make to calculate the electrical axis?

QRS above and below baseline for leads I and III

10. What cells are affected by PTH to increase blood Ca2+ from bone stores?


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