Please enable JavaScript.
Coggle requires JavaScript to display documents.
Cells and Control Part 2 (Synapses and reflexes (Reflexes (Reflexes are…
Cells and Control Part 2
Nervous System
CNS
-
Body has sensory neurons which detect change in environment. Different receptors detect different stimuli
When a stimuli is detected by receptors, the information is converted to a nervous impulse and sent along sensory neurons to the CNS
The CNS coordinates the response and decides what to do. Impulses travel through the CNS along the relay neurone
-
-
Neurones
-
Cell body has extensions that connect to other nuerones, dendrites and dendrons carry nerve impulses to the cell body and the axons carry nerve impulses away form the cell body
Some axons are surrounded by myelin sheath and this acts as a electrical insulator, speeding up electrical impulse
Neurones can be very long, which speeds up the impulse as it connects with another neurone which slows the impulse down so long neurones are much quicker than short ones joined together
Types of neurones
Sensory
One long dendron carries nerve impulses from receptor cells to the cell body which is located in the middle of the neurone
-
-
-
Synapses and reflexes
Synapes
-
-
-
Transmission of a nervous impulse is very fast but is slowed down a bit at the synapse because the diffusion of neurotransmitters across the gap takes time
Reflexes
Reflexes are automatic, rapid responses to stimuli, they can reduce chances of being injured
When a stimulus is detected by receptors, impulses are sent along a sensory neurone to a relay neurones in the CNS
When impulse reaches a synapse between the sensory and relay neurone, they trigger neurotransmitters to be released
-
-
-