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.
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