Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
71 Cards in this Set
- Front
- Back
|
Nerve cells contain a nucleus and a ______ or _____
|
Cell body or soma
|
|
|
Nerve cells contain a _________ and a cell body or soma.
|
Nucleus
|
|
|
The cell body receives impulses from its
______________. |
Dendrite
|
|
|
Dendrites are also called what?
|
Afferent fibers
|
|
|
The cell body sends impulses out via it's
|
axon
|
|
|
Axon is also called
|
efferent fiber
|
|
|
Nerve impulses must cross from axon to dendrite by way of a
|
synapse
|
|
|
The chemical that transmits impulses from one nerve to another is
|
acetylcholine
|
|
|
A fatty sheath called ______ covers many neurons
|
myelin
|
|
|
The interior of a neuron has a ________ charge relative to the outside
|
negative
|
|
|
The extracellular fluid is rich in _______ ________ with a __________ charge
|
sodium ions with a positive charge.
|
|
|
A measure of how much voltage is required to drive the EEG pen a certain distance. Expressed as a comparison of voltage input in microvolts to pen deflection in millimeters.
|
Sensitivity
|
|
|
Calculation for Sensitivity
|
Voltage / amplitude
S= V / A |
|
|
Calculation for Voltage uV
|
Amplitude X Sensitivity
V = A x S |
|
|
Calculation for Amplitude (mm)
|
Voltage / Sensitivity
A = V / S |
|
|
Carry a positive charge and reside in the nucleus of an atom
|
Proton
|
|
|
Carry a negative charge and surround the nucleus in orbits
|
Electrons
|
|
|
States than while unlike charges attract, like charges repel.
|
Coulombs law
|
|
|
The movement of electrons in a conductor
|
electric current
|
|
|
Electrical measurement for current
|
Ampere
|
|
|
Abbreviation for ampere
|
I
|
|
|
Force that makes electrons flow
|
Electromotive Force.
|
|
|
Electromotive force is usually referred to as
|
voltage.
|
|
|
Unit of measure of resistance
|
ohm
|
|
|
Relationship between electricity, current, voltage and resistance is called
|
ohm's law.
|
|
|
Calc. for voltage
|
Voltage = Current X Resistance
E = I X R |
|
|
Calc. for current
|
Current = Voltage / Resistance
I = E / R |
|
|
Calculation for Resistance
|
Resistance = Voltage / current
R = E / I |
|
|
E
|
Voltage
|
|
|
I
|
Current
|
|
|
R
|
Resistance
|
|
|
Resistance is measured in
|
Ohms
|
|
|
Voltage is measured in
|
Volts
|
|
|
Current is measured in
|
Amperes or amps
|
|
|
Capacitance is measured in
|
Farads
|
|
|
impedence is measured in
|
Ohms
|
|
|
Resistance and Impedance are both measured in
|
Ohms
|
|
|
2 main functions of eeg amplifiers
|
1. Discrimination of a signal between two imputs.
2. To increase the size of these potential differences to the level where they can drive the pens of a write out unit. |
|
|
Name two types of amplifiers
|
Single ended and differential
|
|
|
In phase signals are also called what?
|
Common mode signals
|
|
|
Similar to resistors in that they are also materials that do not easily give up electrons
|
Insulators.
|
|
|
The primary affect of the low frequency filter is the attenuation of frequencies...
|
below 5 Hz
|
|
|
Low frequency filter is also called
|
high pass filter
|
|
|
The amount of time it takes the pen to fall to 37% of its initial input
|
decay time constant
|
|
|
The frequency above which there is minimal or no attenuation of an amplitude and below which there is significant attenuation of amplitude
|
cut off frequency
|
|
|
Time required for a capacitor to charge to 63% of its full charge
|
Rise Time constant
|
|
|
The high frequency filter is also called the
|
high pass filter
|
|
|
elements frequencies between 58-62 hz
|
60 hz filter
|
|
|
In the united states we use a standard paper speed of
|
30 mm/sec or 3 cm/sec
|
|
|
Slower paperspeeds have the affect of
|
pushing waves together
|
|
|
faster paperspeeds have the affect of
|
spreading out the waveforms
|
|
|
a measure of how much voltage is required to drive a pen a specific distance.
|
Amplification
|
|
|
Amplification is measured in
|
microvolts per millimeter or uv/mm
|
|
|
Calculation for Sensitivity
|
Voltage / Amplitude
V / A |
|
|
Voltage =
|
Amplitude X sensitivity
A X S |
|
|
Amplitude=
|
Voltage / Sensitivity
V / S |
|
|
number of waves per second
|
Frequency
|
|
|
Frequency is expressed as
|
Hz or CPS
|
|
|
test to see if pens jump when machine is turned on or off
|
electrical baseline
|
|
|
The amount of spacing between the baselines of each channel
|
mechanical baseline
|
|
|
proper alignment of the pens
|
time axis
|
|
|
2 components of the nervous system
|
central and peripheral
|
|
|
The central nervous system consists of...
|
brain and spinal cord
|
|
|
4 parts brain can be divided into
|
cerebrum, diencephalon, brainstem, cerebellum
|
|
|
involved in higher brain functions, thinking sensation and movement
|
cerebrum
|
|
|
4 lobes of the cerebrum
|
frontal, parietal, temporal, occipital.
|
|
|
The diencephalon contains the
|
thalamus and hypothalamus
|
|
|
responsible for pacing rhythmic eeg activity such as alpha and sleep spindles.
|
thalamus
|
|
|
Plays a role in pain sensation and maintenance of alertness
|
thalamus
|
|
|
regulates basic biological needs such as hunger and thirst
|
hypothalamus
|
|
|
The brainstem contains the
|
midbrain, pons, medulla.
|
