Photobiology & Light Science Flashcards
6 cards from real CLT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Photobiology & Light Science flashcards as text
What is the term for the study of the effects of light on living organisms?
Answer: Photobiology
Photobiology is the scientific discipline that examines how light affects living organisms at cellular and systemic levels.
Which part of the electromagnetic spectrum is used in most light therapy applications?
Answer: Visible and near-infrared light
Visible and near-infrared light (400–1100 nm) are the ranges most commonly used in light therapy due to their safe and therapeutic tissue penetration.
What is the Grotthuss-Draper Law in the context of light therapy?
Answer: Only absorbed light can produce photochemical effects
The Grotthuss-Draper Law states that only light that is absorbed by a chromophore can initiate a photochemical reaction.
Which cellular organelle is considered the primary chromophore for red and near-infrared light therapy?
Answer: Cytochrome c oxidase in mitochondria
Cytochrome c oxidase, located in the mitochondrial inner membrane, is the main chromophore that absorbs red and near-infrared light to enhance ATP production.
What does the term 'fluence' refer to in light therapy dosimetry?
Answer: Total energy delivered per unit area (J/cm²)
Fluence, measured in joules per square centimeter (J/cm²), represents the total radiant energy delivered to a surface area during a treatment.
Which principle describes the biphasic dose-response relationship in photobiomodulation?
Answer: Arndt-Schulz Law
The Arndt-Schulz Law describes how low doses stimulate, moderate doses have no effect, and high doses inhibit biological processes.