Week 4 Day 3

Question 1

CO₂ scrubber

Answer 1

CO₂ + H₂O →H⁺ + HCO₃^-

system has NaOH

H⁺ + HCO₃^- +NaOH → H₂O + NaHCO₃

system has Ca(OH)₂

NaHCO₃ + Ca(OH)₂ → NaOH + CaCO₃ + H₂O

*when CaCO₃ is consumed, pH is acidic

Question 2

How does vaporizer control for temp changes and why?

Answer 2

It has two metal pieces that expand and shring with temp changes, moving a thing that allows varying amounts of O2 through, controlling how much O2 goes by the gas.

*increased temp Increases VP which allows the O2 going by the gas to pick up more gas

Question 3

second gas effect

Answer 3

when a large volume of N₂O is taken into bloodstream faster than the other gases, the concentration of the remaining gases increases

Question 4

microshock to heart

Answer 4

smaller current than 0.1 mA is needed to cause V-fib

Question 5

ground fault interrupter

Answer 5

shuts off electrical current when it senses it going along the incorrect path

*it senses a different current coming in then went out

Question 6

Isolation power system

Answer 6

• ungrounded electrical service
• requires two line to ground faults to affect function of equipment or shock anybody

Question 7

line isolation monitor

Answer 7

continually checking for leakage current from each phase conductor

*this is the third year med student

Question 8

Nernst Equation

Answer 8

used to calculate cell potential

V_eq = (61/Z) * log (K_out/K_in) mV

Question 9

membrane potential

Answer 9

the difference in electric potential between the inside and outside of a cell

Question 10

depolarization

Answer 10

the interior voltage of a cell becoming less negative

Question 11

repolarization

Answer 11

the interior of a cell becoming more negative

Question 12

action potential

Answer 12

when the membrane potential of a cell rapidly rises and falls

*for an action potential to happen, the membrane potential must depolarize to the critical threshold

Question 13

SA node

Answer 13

primary pacemaker of the heart

Question 14

steps in action potential

Answer 14

1. Trigger raises membrane potential over threshold
2. Na⁺ channels open, Na comes in, membrane potential rises
3. Na channels close, K channels open
4. K leaves cells, membrane potential falls, below resting
5. K channels close, leaving only “leak” channels

Question 15

contractile myocytes

Answer 15

• resting membrane potential at -90 mV
• depolarize only when stimulated, usually by neighboring myosite.