Homeostasis and Response

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  • Created by: Ash
  • Created on: 08-06-18 16:46

Homeostasis and Response

Homeostasis maintains optimal conditions for enzyme action throughout the body, as well as all cell functions.

In the human body, these include the control of:

  • blood glucose concentration
  • body temperature
  • water levels

These automatic control systems may involve nervous responses (nervous system) or chemical responses (endocrine system).

The Nervous System:

The human nervous system consists of:

  • the central nervous system – the brain and spinal cord, which co-ordinate impulses of info. The CNS coordinates the response of effectors, react in response to a stimuli.
  • the peripheral nervous system – nerve cells that carry information to or from the CNS and is the neural pathway of electrical impulses.

The brain

-The brain is one of the components (parts) of the central nervous system (CNS).

-The CNS coordinates the response of effectors.

-Effectors are muscles or glands that act in response to a change in the internal or external environment.

The Spinal Cord

-The spinal cord is the other component (part) of the CNS. It is also important in coordinating the response of effectors to changes in the environment.

-Essentially, the spinal cord is the pathway for messages sent by the brain to the body and from the body to the brain.

-It's important in coordinating the response of the effectors to changes in the environment as part of the CNS.

The Reflex Arc

-A receptor picks up sensory information from a stimuli (change in the environment)

-Sensory neurones then send this sensory information as electrical impulse to a series of relay neurones, which travel through to the spinal cords.

-These sensory neurones then send an electrical impulse to a motor neurone

-The motor neurones then sends electrical impulses to an effector (muscle or gland) 

-The effector then produces a response

The Neurones

-There are lots of neurones (nerve cells) but…

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Amelia Belrose

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THANK YOU SOOO MUCH!! This was really helpful.