NervousSystem - AP Biology The The Nervous System System...

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AP Biology 2003-2004 The The Nervous Nervous System System
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2003-2004 Regents Biology Overview Overview The Nervous System The Nervous System controls controls and and coordinates coordinates all the functions of the all the functions of the body. body. The Nervous System consists of two The Nervous System consists of two main sub-divisions: main sub-divisions: Central Nervous System (CNS) Central Nervous System (CNS) Peripheral Nervous System (PNS) Peripheral Nervous System (PNS) The Peripheral Nervous System is The Peripheral Nervous System is divided into two sub-divisions: divided into two sub-divisions: Somatic Somatic Autonomic Autonomic
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2003-2004 Regents Biology Structure and Function of the Neuron Neuron is the scientific name for a Nerve Cell. Neurons consist of 3 basic structures: Cyton , or cell body. Dendrites- receive messages, impulses, and send them to the cell body. Axons- send messages away from the cell body. Nerve impulses travel from one neuron to another across synapses , or spaces in between the cells. The “jumping across” the synapse is facilitated (helped) by chemicals called Neurotransmitters .
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2003-2004 Regents Biology
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2003-2004 Regents Biology Nerve Cells (neurons) Basic unit of the nervous system Pass impulses along
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2003-2004 Regents Biology Dendrites Dendrites Branched parts of a neuron that receive impulses from other neurons. Dendrites
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2003-2004 Regents Biology Cell Body Contain the nucleus and cytoplasm Impulses pass through here to the axon. Cell Body
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2003-2004 Regents Biology AXON The axon is a single, long fiber that carries impulses away form the cell body. AXON
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2003-2004 Regents Biology
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2003-2004 Regents Biology
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2003-2004 Regents Biology Types of Neurons Types of Neurons Neurons can also be classified by the Neurons can also be classified by the direction direction that they send information: that they send information: & P Sensory (or afferent) neurons Sensory (or afferent) neurons : : send information send information from sensory receptors (e.g., in skin, eyes, from sensory receptors (e.g., in skin, eyes, nose, tongue, ears) nose, tongue, ears) TOWARD TOWARD the central the central nervous system. nervous system. & P Motor (or efferent) neurons Motor (or efferent) neurons : : send information send information AWAY AWAY from the central nervous system to from the central nervous system to muscles or glands. muscles or glands. & P Interneurons Interneurons : : send information BETWEEN send information BETWEEN sensory neurons and motor neurons. Most sensory neurons and motor neurons. Most interneurons are located in the central interneurons are located in the central nervous system. nervous system.
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2003-2004 Regents Biology Reflexes Reflexes Stimulus- Stimulus- a change in the environment.
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NervousSystem - AP Biology The The Nervous System System...

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