Please enable JavaScript.
Coggle requires JavaScript to display documents.
Cells and control II - Coggle Diagram
Cells and control II
Nervous system
-
-
-
-
-
-
Central nervous system
-
In vertebrates, consists of the brain and spinal chord, long column of neurones
-
-
Reflexes
-
-
-
-
-
-
Reflex arcs
When a stimuli is detected by receptors, impuses are sent along a sensory neurone to a relay neurone in the CNS
When the impulse reaches a synaps, neurotransmitters are released and cause impulses to be sent along the relay neurone
When impulse reaches a synapse between a relay neurones and a motor neurone, neurotransmitters are releaesed can cause impulses to be sent along the motor neurone
-
-
-
Synapses
-
-
-
Slows down transmission, difusion takes time
-
Process
-
Electrical impulse causes chemical neutransmitter to be released from vehicles in the neurone into the gap between the neurones
Neutransmitter diffuses across the gap and fits into receptors, causing a new electrical impulse in the next neurone
Types of neuron
-
Motor
-
-
Long axon, carries impulses from the cell body to the effector cells
The electrical impulse jumps from one gap in the myelin sheath to the nextm speeding up the rate of transmisison
Nerve endings transmites the impulse to an effector, such as a muscle or a gland
-
Relay
-
Many short dendrites, carry impulses from sensory neurones to the cell body
-
-
Neurone structure
-
-
-
Myelin sheath is a fatty layer that surrounds some axons, it acts as a chemical insulator and speeds up the impulse
-
-
Process
-
-
Information is processed and the appropriate response is coordinate, reulting in an electrical impulse being sent along motor neurones
Effectors carry out the response, may be muscles or glands
-
-