GCSE Biology (AQA)

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The Nervous System

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Homeostasis and Response Homeostasis

The Nervous System

2:56 Homeostasis and the Nervous System
Spec 4.5.2.1
Previous Homeostasis Next Receptors & Effectors
  • The nervous system detects environmental changes and coordinates responses.
  • Responses include moving away from perceived dangers, such as a bee.
  • A stimulus is a change in the environment, like seeing a bee; the plural is stimuli.
  • The response to a stimulus, such as a bee, might be moving in the opposite direction.
  • The nervous system consists of a network of neurons (nerve cells) that extend throughout the body.
  • Neurons transmit information as electrical impulses from one end to the other.
  • The central nervous system (CNS) is composed of the brain and spinal cord.
  • The CNS uses neurons to process information and coordinate activities like catching a ball.
  • In the process of catching a ball, the moving ball acts as a stimulus.
  • Cells in the eye receive light and act as receptors, signaling that the ball is approaching.
  • The brain, acting as a coordinator, decides on a response and communicates with effectors, such as muscles.
  • The response, in this case, would be catching the ball, demonstrating the CNS's role as a coordinator in nervous responses.
  • Neurons are long to facilitate message transmission over distances and are bundled together to form nerves.
  • In exams, understanding the roles of stimuli, responses, nerve cells, and the CNS's function is crucial.

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