Nervous System
Name 3 functions of the nervous system
What is Sensation, Integration, Motor output, higher mental functions, emotions
What provides support and protection of neurons? They are smaller than neurons and more numerous.
What is Neuroglia
Found at the end of the axon
Axon terminals / synaptic end bulbs
What part of a neuron is made up of protein and fatty substance?
Myelin sheath
What are the three basic functional classes of nerves?
Sensory neurons, Motor neurons, and Interneurons
2 subdivisions of the PNS
Autonomic and somatic
What does CNS stand for?
Central Nervous System
The peripheral nervous system is divided into two divisions, what are they?
Afferent (sensory) and Efferent (motor)
Synapse
Special chemicals that transmit info from one neuron to another is called what?
Neurotransmitters
Two subdivisions of the Autonomic Nervous System
What is Parasympathetic Division- "rest and digest" and Sympathetic "Fight of Flight"
Name three parts of a neuron
1- cell body (soma) 2- dendrites 3- axon 4- myelin sheaths 5- axon terminals 6- nodes of ranvier
What are the 4 main lobes of the brain?
1. Frontal 2. Parietal 3. Temporal 4. Occipital
What job does a dendrite do?
Gather information
There are approximately how many neurons in the human brain?
100 billion
The central nervous system is made of these organs
Brain and spinal cord
What does an axon terminal hold?
Neurotransmitters
Name any three neurotransmitters
Acetylcholine, norepinephrine, dopamine, serotonin
What purpose does the myelin sheath provide?
Allows information to travel more efficiently
Neurons that take information back to your body are called what?
Motor neurons
An action potential travels along this
A neuron's axon
What part of the brain serves as a relay station?
What is the gap between the myelin sheaths on the axon called?
Nodes of ranvier
What is the most important cell in the nervous system called?
What does PNS stand for?
Peripheral nervous system