Examlex
A QRS complex with one positive deflection followed by one negative deflection would be labeled
Physical Stimulus
An external event or factor that influences a physical response or reaction in an organism.
Light
Electromagnetic radiation within a certain portion of the electromagnetic spectrum, visible to the human eye and responsible for the sense of sight.
Vision
The ability to see, resulting from the processes of light being detected by the eyes and interpreted by the brain.
Colour
The property of objects as perceived by the human eye and brain due to the way an object reflects or emits light.
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