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38 Cards in this Set
- Front
- Back
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What is the function of the nervous system?
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The nervous system is the communications network of the body.
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How many parts does the nervous system have? Elaborate.
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It has two parts:
Central nervous system, consisting of: The brain and spinal cord The peripheral nervous system, radiating from the spinal cord to muscles, internal organs and skin. |
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Where does the nervous system extend from?
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The spinal cord to muscles
Internal organs Skin |
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Sensations from the environment outside the body, internal organs and other tissues are interpreted and the appropriate reaction is registered by the ________.
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brain
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________from the environment outside the body, _________and ________are interpreted and the appropriate reaction is registered by the brain.
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Sensations
internal organs other tissues |
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What do nerve fibres form?
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The bulk of the brain,
Spinal cord and Peripheral nerves |
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What does every nerve fibre consist of?
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A thread-like axon, which may range from a few centimetres to many centimetres in length.
The fiber may or may not be covered by a fatty myelin sheath, produced by Schwann cells. |
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Describe what a thread-like axon look like?
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It may range from a few centimetres to many centimetres in length.
The fiber may or may not be covered by a fatty myelin sheath, produce by Schwann cells. |
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How is a fatty myelin sheath produced?
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By Schwann cells
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How are nerve fibres classified?
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Myellinated
or Nonmyelinated. |
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There are gaps in the myelin sheath. What are the gaps called?
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Nodes of Ranvier
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What is the function of the nodes of Ranvier?
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Nutrients can be absorbed and waste products excreted
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What can happen when the myelin covering is lost?
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Disease can occur
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What forms the white matter of the brain and spinal cord?
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Myelinated fibers form the white matter of the brain.
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What comprises the gray matter of the brain and spinal cord?
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Nerve cell bodies.
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What is the basic unit of the nervous system?
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A neuron
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What is the function of the nodes of Ranvier?
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Nutrients can be absorbed and waste products excreted.
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What can happen when the myelin covering is lost?
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Disease can occur.
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What comprises the gray matter of the brain and spinal cord?
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Nerve cell bodies
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What is the basic unit of the nervous system?
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A neuron
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The basic unit of the nervous system is a neuron. What does it consist of?
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A nerve cell with several branching processes (dendrites) which receive nerve impulses (waves of changing electrical energy).
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What is the function of a nerve cell’s several branching processes?
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It receives nerve impulses (waves of changing electrical energy)
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Give another name for branching processes.
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Dendrites
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Give another name for nerve impulses.
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Waves of changing electrical energy
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Dendrites and nerve impulses pass down ___________faster-at over 328 feet (100 meters) per second-than through___________.
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myelinated fibers
nonmyelinated fibers |
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___________are passed from the end of one fiber to another via a synapse or to a muscle fiber at a neuromuscular junction.
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Impulses
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What are passed from the end of one fiber to another via a synapse or to a muscle fibre at a neuromuscular junction?
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Impulses
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Impulses are passed from the end of one fiber to another. How?
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Via a synapse or to a muscle fibre at a neuromuscular junction.
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Impulses are passed from the end of one fiber to another via a synapse or to a muscle fibre at a_____________.
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Neuromuscular junction
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The basic unit of the nervous system is a neuron. What does it consist of?
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A nerve cell with several branching processes (dendrites) which receive nerve impulses (waves of changing electrical energy).
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What is the function of a nerve cell’s several branching processes?
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It receives nerve impulses (waves of changing electrical energy)
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Give another name for branching processes.
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Dendrites
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Give another name for nerve impulses.
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Waves of changing electrical energy
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Dendrites and nerve impulses pass down ___________faster-at over 328 feet (100 meters) per second-than through___________.
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myelinated fibers
nonmyelinated fibers |
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___________are passed from the end of one fiber to another via a synapse or to a muscle fiber at a neuromuscular junction.
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Impulses
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What are passed from the end of one fiber to another via a synapse or to a muscle fibre at a neuromuscular junction?
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Impulses
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Impulses are passed from the end of one fiber to another. How?
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Via a synapse or to a muscle fibre at a neuromuscular junction.
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Impulses are passed from the end of one fiber to another via a synapse or to a muscle fibre at a_____________.
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Neuromuscular junction
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