P3

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  • Created by: bethany_s
  • Created on: 30-05-17 20:05
X-Rays
High energy electromagnetic waves
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Ultrasound
Sound waves which are non-ionising and have a higher frequency than we can hear
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CAT scans
Use X-Rays to produce a 2d image of someone's body
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Endoscopes
Devices that can see inside of the body due to the use of obtical fibres
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Radiation
Energy which originates from a source
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Refraction
When radiation changes direction due to a change in speed when it enters a new medium
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Converging lenses
Cause rays of light to converge and are convex
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Diverging lenses
Cause rays of light to diverge and are concave
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Iris
The coloured part of the eye which is made of muscles which control the pupil size
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Cornea
The convex window of the eye which is responsible for a lot of focussing
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Retina
The part of the eye that detects light and sends messages, via the optic nerve, to the brain
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lens
Does some of the eyes focussing and can change shape depending on ciliary muscle movement
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The near point
The closest distance at which the eye can focus- 25cm
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The far point
The furthest distance at which the eye can focus comfortably- infinity
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Short sight
When someone cannot focus on distant objects
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Long sight
When someone cannot focus on close-up objects
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Laser eye surgery
Using a laser to vaporise tissue can correct eye faults
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Contact lenses
Sit on top of the cornea and are designed to compensate for eye faults
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Total Internal reflection
When 'i' reaches a critical angle and the light is reflected along the boundary so 'r'= 90 degrees
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Optical fibres
Fibres which transport visible light using total internal reflection
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Thermionic emission
It is the release of electrons from a surface due to heat
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The Inverse square relationship
e.g. if you move twice as far from the source, the radiation is spread over 4x the area
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Resting potential
The potential difference through the cell membrane of a resting muscle cell
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An electrocardiograph (ECG)
They record rhe action potentials of the heart through the use of electrodes
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The heart's natural pacemaker
A group of cells in the r. atrium wall which produce electrical signals to stimulate the heart to beat
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Pulse oximetry
It can measure the amount of oxygen being carried by haemoglobin in blood
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Alpha radiation
Helium nuclei
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Beta radiation
Electrons
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Gamma radiation
Electromagnetic radiation
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Positron radiation
Positively charged beta radiation
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Quarks
Particles which make up neutrons and protons
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Internal radiation therapy
This is where a radioactive ubstance is placed inside of the body which gives a high dose of radioactivity to a small area
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External radiation therapy
Aiming X-rays or gamma rays at a tumour from outside of the body
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Palliative care
It reduces suffering without curing an illness
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Velocity
Speed in a certain direction
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Cyclotrons
Circular particle accelerators which use magnetic fields to accelerate particles
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Proton enrichment
Bombarding stable elements with protons
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Elastic collisions
Collisions where kinetic energy as well as momentum is conserved
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Inelastic collisions
Collisions where some kinetic energy is converted into other forms but momentum is still conserved
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Annihilation
Something that occurs when a particle meets its antiparticle
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Triangulation
A process which is used to detect tumours
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Solids
Where strong forces of attraction hold particles tightly together
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Liquids
Where weaker forces of attraction allow particles to stay close together but move around
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Gases
Where there are virtiually no forces of attractions and particles can move all over the place
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Absolute zero
-273 degrees C, 0 Kelvin
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Pressure
Created when gas particles collide with one another
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Flow rate
The volume of gas per unit time
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Other cards in this set

Card 2

Front

Sound waves which are non-ionising and have a higher frequency than we can hear

Back

Ultrasound

Card 3

Front

Use X-Rays to produce a 2d image of someone's body

Back

Preview of the back of card 3

Card 4

Front

Devices that can see inside of the body due to the use of obtical fibres

Back

Preview of the back of card 4

Card 5

Front

Energy which originates from a source

Back

Preview of the back of card 5
View more cards

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