Homeostasis and Response
- 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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