Biology F214: Nerves

Nervous System consists of?
Central Nervous System (CNS) and Peripheral Nervous System (PNS)
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The CNS is composed of the..
Brain and Spinal Cord
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The PNS consists of cranial nerves attached to the
Brain
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And spinal nerves attached to the
Spinal Cord
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The Nervous System is divided into 2 functions:
Voluntary and Involuntary
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Voluntary Nervous System sends what information to the CNS?
Sensory information about the surroundings
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Involuntary Nervous System sends sensory info about what to the CNS?
The internal environment
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The involuntary nervous system controls what?
Organs such as the Heart and Stomach
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Sensory receptors are transducers meaning what?
They convert one form of energy into another
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The receptor molecules are what to those of the molecules they detect?
Complementary
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Nerve cells are specialised cells that transmit what over what distances?
Electrical impulses over long distances
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Impulses travel along
Neurones (in one direction)
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A nerve is a bundle of?
Neurones
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Surrounded by?
Fibrous Tissue
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All neurones in peripheral nerves are surrounded by what?
Schwann cells
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Schwann cells are specialised how?
Insulated my myelin that acts as an insulator
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Sensory Neurones transmit impulses from where to where?
Sensory cells to the CNS
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Motor Neurones transmit impulses from where to where?
CNS to the Effectors (muscles and glands)
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Schwann Cells are wrapped around what?
Neurones
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Each layer of Myelin consists of how many membranes?
2 membranes
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What is sandwiched between them?
Thin layer of Cytoplasm
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Features of Sensory Neurones
Sensory Dendrites -> Through Dendrons -> Cell Body -> Dendrons -> Synaptic Knob
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What is found between dendrons?
Nodes of Ranvier
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What is the Myelin Sheath surrounding?
The Axon
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Features of Motor Neurones
Dendrites -> Cell Body -> Dendrons (consisting of Myelin Sheath) -> Synaptic Knob
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Action Potentials (Myelinated vs. NM)
S: only at Nodes of Ranvier M: Along whole length
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Conduction of Impulse (M vs. NM)
S: Saltatory M: Contiguous
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Speed of Impulse Transmission ms-1 (M vs. NM)
S: 100-120 M:10-20
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What is the role of NM in mammals?
Voluntary nervous system - Skeletal Muscle contraction
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Role of M in mammals?
Involuntary nervous system - Controlling heart rate
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Other cards in this set

Card 2

Front

The CNS is composed of the..

Back

Brain and Spinal Cord

Card 3

Front

The PNS consists of cranial nerves attached to the

Back

Preview of the front of card 3

Card 4

Front

And spinal nerves attached to the

Back

Preview of the front of card 4

Card 5

Front

The Nervous System is divided into 2 functions:

Back

Preview of the front of card 5
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