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What does the Central Nervous System (CNS) encompass?
The brain and the spinal cord
What makes up the Peripheral Nervous System?
It includes all the nerve attached to the brain and spinal cord. Basically, the nervous system outside the CNS.
What is a neurone and what does it do?
It is a nerve cell, it processes information and transmits to the nervous system.
What are the 3 types of neurons? What are their functions?
- -Sensory neuron: detects changes in the
- internal or external environment and
- communicates these changes to CNS
- -Motor neuron: in CNS, controls muscle
- contraction and gland secretion
-Interneurons: located entirely within the CNS (local and relay interneurons)
What are the different parts of a Neuron?
- -Soma: neurone cell body, contains nucleus
- -Dendrites: Branches off the soma, receiving info from other terminal buttons.
- -Axon: conveys info/action potential from soma to terminal buttons (long slender cylindrical myelin sheath)
- -Terminal Buttons: Bud at end of axon branch, sends info to other neurons via transmitter substance across the synapse.
A chemical that has either an inhibitory or excitatory effect on another neuron
The junction between the terminal button of one neuron and the dendrite/membrane of soma of the receiving neuron
What is the process of exocytosis?
The secretion of substance by cell through vesticles. Process by which neurotransmitters are secreted
What are the three different types of neuron classifications?
- Multipolar: one axon and many dendrites off soma
- Bipolar: one axon and one dendrite off soma
- Unipolar: one axon off soma and divides.