- Created by: ErinSunderland16
- Created on: 20-02-19 13:22
- The Nervous System:
- The Nervous System is split into two distinct parts: the central nervous system and the peripheral nervous system.
- The Central Nervous system (CNS) is located in the central part of the body, and consists of the brain and the spinal cord.
- The peripheral nervous system is everything else apart from the brain and spinal cord. This is spread throughout the rest of the body.
- Homeostasis is a combination of nervous and chemical responses.
Structure of the nervous system:
- The body is carefully regulated by the hormonal (endocrine) and nervous systems.
- Control systems in the nervous system include the following parts:
1. Stimulus - change in the environment.
2. Receptors - detect the change.
3. Coordinator - organises the response.
4. Effectors - create a response.
5. Response - caused by an effector.
- Neurones are specialised cells that carry elctrical impulses.
- Sense organs include the eye that detect the stimulus light.
- A reflex arc creates an automatic, rapid response and is used to limit damage to the individual.
- Reflex arc includes the following parts:
1. Stimulus - is detected.
2. Receptor - detects the change.
3. Sensory neurone - impulses travel along these towards the spinal cord.
4. Relay neurone - located within the spinal cord, and connects sensory and motor neurones.
5. Motor neurone - connect the relay neurone to the effector.
6. Effector - creates a specific response, examples includes glands and muscles.
7. Response - created by an effector as a direct result of the inital stimulus detected.
- A synapse is a gap between the two neurones. Neurotransmitter diffuses across it.
- The Brain is a very complex organ, and controls complex behaviour such as nervous responses and homeostasis, and contains billions of neurones.
- Three main areas inside the brain that carry out different functions are:
The Cerebral Cortex - The outer layer of the cerebrum, which is split into two hemispheres. It controls memory, language, conscious, thought and intelligence.
The cerebellum is…