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What is the Nervous system made of?
CNS and PNS
Neurons
What does the CNS consist of?
All of the body
Brain and spinal cord
What is true about the PNS? (1<)
Cranial nerves branch from the brain
Sends and receives messages to and from the CNS
Processes all of the info
Spinal nerves branch out from the spinal cord
In Neurons do Dendrites which branch out and receives messages?
What does the myelin sheath do?
sends nerve impulses along the cell
Ensures the electrical signal doesn't pass to other neurons
Are the two types of neurons the sensory and motor?
What is the synapse?
The direction
Neurotransmitters
The space between the neurones
Sensory neurons- carry messages from the sensory organs to the CNS What does it consist of?
Eyes ears...
Skin, nails
Motor neurones- carry messages from the CNS to the effectors that put the messages into effect what are the parts?
eyes, skin
. Muscles or glands
brain and spine
Neurotransmitters: A chemical message which is released at the end of a nerve fiber by the arrival of a nerve impulse
Sympathetic: system to calm down
Parasympathetic: system helps us to calm down
Sensory neurons: Tells us something has happened from the receptors
Motor neurons: Gives effect from the hypothalamus
What is the Stimulus?
Affects that the sensory neurons detects
Receptor
hormone
What is a Relay neuron
reacts to things without the brain sending the meassgage
a reflex
The relay neuron in the spinal cord passes the message to a motor neurone to react. Passed back to the brain. Acts as a reflex
Autonomic nervous system: Prepares your body to be alert (sympathetic) and to calm down (parasympathetic).
By redirecting blood to and from the certain areas that are likely to be used, muscles and effectors.
Responsible for collecting information from our senses and body’s movement
Our bodies ensure that:
we maintain healthy levels of oxygen, water and the temperature
our blood is healthy and our brain
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