- Created by: maddieecarr
- Created on: 27-11-19 17:10
B10.1: Principles of Homeostasis
- homeostasis is the regulation of the internal conditions of a cell or organism to maintain optimum conditions for function in response to internal and external changes.
- homeostasis is important for maintaining optimal conditions for enzyme action and all cell functions.
- in the human body homeostasis includes the control of blood glucose concentration, body temperature and water levels.
- the automatic control systems may involve nervous or chemical responses.
- all control systems include receptor, co-ordination centres and effectors.
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B10.2: The Structure and Function of the Human Ner
- the nervous sytem uses electrical impulses to enable you to react quickly to your surroundings and coordinate your behaviour.
- cells called receptors detect stimuli.
- impulses from receptors pass along sensory neurones to the brain or spinal cord (CNS).
- the brain coordinates the response and impulses are sent along motor neurones from the brain to the effectors.
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B10.3: Reflex Actions
- reflex actions are automatic and rapid and don't involve the concious parts of the brain.
- reflexes involve sensory, relay and motor neurones.
- reflex actions control everyday bodily functions and to keep you out of danger.
- the reflex arc:
- sensory neurone
- relay neurone
- motor neurone
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