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B10 - The human nervous system - Coggle Diagram
B10 - The human nervous system
Reflex actions
Reflex actions control everyday bodily functions, such as breathing and digestion, and help you avoid danger.
The main stages of reflex arc are;
Reflexes involve sensory, relay, and motor neurons.
Stimulus -> receptor -> sensory -> coordinator (CNS) -> motor neuron -> effector -> response
Reflex actions are automatics and rapid and do not involve the conscious parts of the brain.
Principles of homeostasis
The automatic control systems may involve nervous or chemical responses.
In the human body homeostasis controls blood glucose concentration, body temperature and water levels.
All control systems include receptors, coordination centers and effectors.
Receptors detect stimuli - Coordination centers; brain, spinal cord, and organs (pancreas) - effectors muscles or glands, bring response to stimulus.
It is important for maintaining optimum conditions for enzyme action and all cell functions.
Is the regulation of the internal conditions of a cell of organism to maintain optimum conditions, in response to internal and external changes.
Structure and function of human nervous system
Impulses from receptors pass along sensory neurons to the brain or spinal cord (CNS)
The brain coordinates the response, and impulses are sent along motor neurons from the brain (CNS) to the effector organs.
Cells called receptors detect stimuli - changes in environment.
Stimulus -> receptor -> sensory -> coordinator (CNS) -> motor neuron -> effector -> response
The nervous system uses electrical impulses to enable you to react quickly to your surroundings and coordinate your behavior.