The Human Nervous System
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Give 3 examples of a sense organ
Eyes Ears Skin
What are the main parts of the CNS?
Brain Spinal cord
How does the CNS work?
The receptor cells in the sensory organs bring the Information as electrical impulses to the sensory neurones who give it to the relay neurons in the CNS to sort out. This information is then given to the motor neurones who pass it onto the effector cells in the muscle.
What does the human nervous system contain of?
The brain Spinal cord Peripheral nerves
Where are receptor cells found?
In the sensory organs
Explain a sensory neurone
A sensory neuron carries information to the CNS from the receptor cells in the form of electrical impulses
Explain a relay neuron
Relay neurones are involved in transferring information from sensory neuron to the motor neurones
Why is a relay neuron highly branched?
It is highly branched to allow connections with a greater number of neurons
Explain a motor neurone
Motor neurones are involved in transmitting messages from the Relay neurones to the effector cells found in muscles and glands
What is a reflex action?
A reflex action is a very quick response that usually happens when danger is sensed by the receptor cells
Why is a reflex action so rapid?
A reflex action or a reflexed Ark is extremely rapid because the only consists of three neurones
What is a synapsis?
A synapsis is a microscopic gap between neurons
What is the form of the nerve impulse transported across the synapses?
The nerve impulse is transported across the gap in the form of a chemical
Give four examples of a reflex action
Blinking coughing sneezing and withdrawing hand from hot objects
What are hormones?
Hormones are a type of chemical messenger which are released into the blood by certain glands
Where is insulin produced?
It is produced in the pancreas
What are Thermoreceptors?
They detect temperature in the skin
What are effectors?
Affecters triggers a response in the muscles to carry out a specific action
Give an example of negative feedback control
The regulation of body temperature
Explain type one diabetes
Take one diabetes is developed when there is no insulin being produced by the pancreas
Explain type two diabetes
When the insulin does not work properly or there is not enough
State the general function of receptors as part of the nervous system
To convert stimuli to electrical impulses
Describing the flow of information along a reflex arc
Stimuli affects receptors electrical impulses pass through sensory neurons processed by relay neurons is in the spinal cord electrical impulses sent to affecters effectors make the response