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Neurons
Homework Due TodayRead Section 31.1Answer question 1-3 on page 900
HomeworkDescribe the function of the
nervous system?
The functions of the nervous sustem are to collect information about the body’s internal and external environments, process that information and respond to it
HomeworkDescribe how your peripheral
nervous system and central nervous system were involved in a simple activity you performed today.
HomeworkName and describe the three
types of neuronsSensory neurons carry impulses
from the sense organs. Motor neurons carry impulses from the brain and spinal cord to muscles and glands. Interneurons process the information from sensory neurons and send commands to other interneurons or motor neurons
HomeworkThe immune system of people
with multiple sclerosis attacks myelin sheaths in the CNS. The myelin breaks down and scar tissue may result. How do you think this would affect the transmission of signals from the CNS?
HomeworkWhat happens when a neuron in
stimulated by another neuron?
If the stimulus is grat enough, an impulse begins that travels rapidly along the axon toward the axon terminals, where the impulse may be passed on to other cells
HomeworkHow can the level of pain you
feel vary if a stimulus causes and all-or-none response?
Although the response is all-or-none, the frequency of action potentials can vary depending on the strength of the stimulus
Homework Due Next ClassFinish WorksheetDefine:
◦Peripheral Nervous System◦Central Nervous System◦Axon◦Myelin Sheath◦Threshold◦Synapse◦Neurotransmitter
The Nervous SystemThe Nervous System
The Nervous SystemThe Nervous System responds to
information collected from internal and external environments
Comprised of Peripheral Nervous System and Central Nervous System
Central Nervous SystemConsists of the brain and spinal
cord
Peripheral Nervous SystemAll nerves and supporting cells
that collect information about the body’s internal and external environment
PNS/CNSConstant communication is
happening between the 2 nervous systems
You’re walking around in the dark and can’t see anything. Your hands are reaching for the light switch and your PNS relays the message of what it is touching to the CNS, which relays back to the PNS as to what it is supposed to be looking for.
NeuronsAll impulses (messages) are
transmitted by cells called neurons◦Sensory◦Motor◦Interneurons
Process sensory information and send commands to other neurons
Structure of Neuron
Cell BodyLargest part of a neuronHouses the nucleus and most of
cytoplasm
Homework Due Next ClassFinish WorksheetDefine:
◦Peripheral Nervous System◦Central Nervous System◦Axon◦Myelin Sheath◦Threshold◦Synapse◦Neurotransmitter