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BIOL 1115 (41)
Lecture 41

BIOL 1115 Lecture 41: ch_41 notes

5 Pages
28 Views
Spring 2016

Department
Biology
Course Code
BIOL 1115
Professor
terrikanner
Lecture
41

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ch 41
Rhea Khilnani Sun Dec 11 07:33:04 PST 2016
Central Nervous System (CNS)
Brain and spinal cord
perpheral nervous system
all the nerves outside of the brain or spinal cord
neurons
Send and receive electrical and chemical signals to effector cells Effector cells
Neurons
Muscles
Glands
Cell body or soma
Contains nucleus and organelles
Dendrites
Extensions of cell body, single or branching Receive incoming signals
Axon
Extension of cell body Send signals to other cells Typically single May have branches and may be wrapped in myelin
Insulator
Axon hillock
near cell body
Site of nerve impulse generation
Axon terminals
convey electrical or chemical signals to other cells Typically occur in bundles called nerves
Glia
Surround neurons and perform numerous functions
Astrocytes
Metabolic support Form the blood-brain barrier
Microglia
Participate in immune functions
Oligodendrocytes (CNS) and Schwann cells (PNS)
Produce myelin sheath
Sheath is interrupted by noninsulated nodes of Ranvier
Sensory neurons
Detect information from:
outside world
internal body
Afferent neurons – transmit to CNS
Motor neurons
Send signals away from CNS to elicit response Efferent neurons
Interneurons
Connectors between neurons Interpreter neurons
Reflex arc
Stimulus from sensory neurons sent to CNS (spinal cord); signal interpreted in spinal cord and transmitted to motor neurons to elicit
response Quick and automatic response
Electrical Properties of Neurons andthe Resting Membrane Potential
The functions of the nervous system—sensation, integration, and response—depend on the functions of the neurons The basis for the
communication
Action potential
Neurons communicate
because they possess an excitable membrane
excitable membranes generate signals
Plasma membrane
Regulates what enters and exits a cell Barrier that separates charges
Ions cannot pass through membrane without assistance
Require a transport channel
Transmembrane proteins – channel, carrier
Electrical Properties of Neurons
As with all cells the cell membrane of a neuron is polarized
Inside of cell is negative relative to the outside
Unequal distribution of ions  electrical potential difference
Voltmeter can be used to measure the electrical potential difference across the membrane
Membrane potential
Resting membrane potential
Polarized membranes exhibit a resting membrane potential
Occurs when a cell is not being stimulated or conducting impulses (resting)
-70 millivolts
Degree of polarization
Changes in membrane potential are changes in degree of polarization
Depolarization

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Description
ch 41 Rhea Khilnani Sun Dec 11 07:33:04 PST 2016 Central Nervous System (CNS) Brain and spinal cord perpheral nervous system all the nerves outside of the brain or spinal cord neurons Send and receive electrical and chemical signals to effector cells Effector cells Neurons Muscles Glands Cell body or soma Contains nucleus and organelles Dendrites Extensions of cell body, single or branching Receive incoming signals Axon Extension of cell body Send signals to other cells Typically single May have branches and may be wrapped in myelin Insulator Axon hillock near cell body Site of nerve impulse generation Axon terminals convey electrical or chemical signals to other cells Typically occur in bundles called nerves Glia Surround neurons and perform numerous functions Astrocytes Metabolic support Form the blood-brain barrier Microglia Participate in immune functions Oligodendrocytes (CNS) and Schwann cells (PNS) Produce myelin sheath Sheath is interrupted by noninsulated nodes of RanvierSensory neurons Detect information from: outside world internal body Afferent neurons transmit to CNS Motor neurons Send signals away from CNS to elicit response Efferent neurons Interneurons Connectors between neurons Interpreter neurons Reflex arc Stimulus from sensory neurons sent to CNS (spinal cord); signal interpreted in spinal cord and transmitted to motor neurons to elicit response Quick and automatic response Electrical Properties of Neurons andthe Resting Membrane Potential The functions of the nervous systemsensation, integration, and responsedepend on the functions of the neurons The basis for the communication Action potential Neurons communicate because they possess an excitable membrane excitable membranes generate signals Plasma membrane Regulates what enters and exits a cell Barrier that separates c
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