Science // Biology // B1 // Nervous system // Part 2 //
- Created by: ameburrell9
- Created on: 22-11-14 14:24
View mindmap
- Nervous system
- The central nervous system is the brain and spinal cord.
- Once the information hits the central nervous system, there is a choice of two things
- Reflex action
- The message may be passed straight to a motor neurone via a relay neurone, this is a quick process.
- Reflex actions are fast, they protect the body and they do not need conscious thought.
- All reflex actions involve the brain, the pupil reflex govia the brain for example.
- Reflex actions
- All reflex actions involve the brain, the pupil reflex govia the brain for example.
- Reflex actions are fast, they protect the body and they do not need conscious thought.
- The message may be passed straight to a motor neurone via a relay neurone, this is a quick process.
- Voluntary action
- The message can be sent to the higher centres of the brain and the organism might decide to make a response.
- Vountary actions ned a conscious decision in order to take place. They therefore always involve the brain.
- The message can be sent to the higher centres of the brain and the organism might decide to make a response.
- Reflex action
- Once the information hits the central nervous system, there is a choice of two things
- Reflex arc
- The reflex arc does not require a conscious action, which might be too slow
- A reflex arc is the subconscious movement from a stimulus that can cause harm e.g bee sting.
- The cerebral hemisphere is the area of the brain where the decisions are made. Nerve impulses from here are sent down the spinal cord to effectors via the motor neurones.
- The reflex arc does not require a conscious action, which might be too slow
- The central nervous system is the brain and spinal cord.
Comments
No comments have yet been made