lesson
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Touch a scorching hot pan, and your hand pulls away in less than a tenth of a second. Yet, managing your blood sugar after lunch takes hours.
Your body relies on two distinct communication networks to respond to stimuli and maintain homeostasis — the process of keeping internal conditions stable and balanced.
Both networks operate under a universal response model: Stimulus→Receptor→Coordination Centre→Effector→Response.
Receptors detect a stimulus, a coordination centre (such as the brain, spinal cord, or pancreas) processes the input, and an effector (a muscle or gland) produces the response.
Both systems operate under a universal response model: Stimulus→Receptor→Coordination Centre→Effector→Response.
A coordination centre (such as the brain, spinal cord, or pancreas) receives and processes inputs from receptors before directing effectors to respond.
Why does your body need two completely different communication networks instead of just one?
The Nervous System: High-Speed Wires
The nervous system sends rapid electrical impulses along specialized cells called neurones directly to specific muscles or glands.
Because signals travel along dedicated pathways at up to 100 meters per second, nervous responses are virtually instantaneous and usually short-lived.
📊Interactive diagram
If electrical impulses are so fast, why don't we use them for every single process in the body?