B1.2: Responses to a changing environment

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Flash cards for B1.2 topic, Responses to a changing environment. Part of the Edexcel GCSE course.
Tinna Shabsogh
Flashcards by Tinna Shabsogh, updated more than 1 year ago More Less
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Tinna Shabsogh
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Resource summary

Question Answer
Define Homeostasis Maintaining a stable internal environment
Sensory neurones Take nerve impulses from receptors to the central nervous system
Relay neurones In the central nervous system. Take nerve impulses from sensory neurones to motor neurones.
Motor neurones Take impulses from the central nervous system to muscles or glands (effectors).
Name 2 hormones found in humans Insulin, adrenaline, testosterone, oestrogen, and progesterone.
Define Reflex arc Reflex actions bypass the brain, speeding up response times. Used when the body is in danger.
Give an example of a reflex action Iris reflex - Iris contracts or expands depending on light level
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