Nervous system 🙀 Flashcards
Term that describes the region where two neurons come into close contact
Synapse
Name given to the gap between two neurons
Synaptic cleft
Describe how nerve impulses travel between two neurons in close contact
Impulse arrives,
neurotransmitter released, enzymes break down neurotransmitter
Names of three types of neuron found in the human nervous system
Sensory, motor, interneuron
One possible treatment for Parkinson’s or paralysis
Physiotherapy or surgery
Two parts of the human nervous system
CNS, PNS
Distinguish between the function of an interneuron and a sensory neuron
Interneurons transmit impulses within CNS,
Sensory Neurons transmits impulses to CNS
How is a nerve impulses conducted along a neuron
Movement of ions
One cause of paralysis
Injury to spinal cord
One cause of Parkinsons
Decrease in serotonin and dopamine levels
What is a reflex action
Automatic response to a stimulus
Two Examples of reflex action in the human body
Blinking, Iris response
Two advantages of a reflex action
Protection, fast
Describe how a reflex action works
Stimulus detected by receptor,
Impulse set up at receptor,
Impulse sent along sensory neuron,
To the effector,
Effector reacts
Two ways in which a nervous response differs from a hormonal response
Nervous response is fast and hormonal response is slow,
Nervous response is electrical hormonal response is chemical
Substance released by dendrites
Neurotransmitter
Substance produces by Schwann cell
Myelin
Function of myelin
To speed up the impulse
Role of dendrites
Receive impulses
Role of axon
carries impulses away from cell body
Role of cell body
Receive impulses
How nerve impulses are transmitted across a synaptic cleft
Impulse arrives,
Neurotransmitter is released into synapse,
Enzymes break down neurotransmitter
Function of meninges
Protection of CNS
How many layers are present in the meninges
Three
