2 Do NowDo NowHow does this relate to the Nervous System?
3 Homework Due TodayRead Section 31.1Answer question 1-3 on page 900
4 Homework Describe 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
5 HomeworkDescribe how your peripheral nervous system and central nervous system were involved in a simple activity you performed today.
6 Homework Name and describe the three types of neurons Sensory 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
7 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?
8 Homework What 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
9 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
10 Homework Due Next Class Finish WorksheetDefine:Peripheral Nervous SystemCentral Nervous SystemAxonMyelin SheathThresholdSynapseNeurotransmitter
12 The Nervous SystemThe Nervous System responds to information collected from internal and external environmentsComprised of Peripheral Nervous System and Central Nervous System
13 Central Nervous System Consists of the brain and spinal cord
14 Peripheral Nervous System All nerves and supporting cells that collect information about the body’s internal and external environment
15 PNS/CNSConstant communication is happening between the 2 nervous systemsYou’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.
16 NeuronsAll impulses (messages) are transmitted by cells called neuronsSensoryMotorInterneuronsProcess sensory information and send commands to other neurons