The The Nervous Nervous SystemSystem

Functions of the Nervous Functions of the Nervous SystemSystem

1.1. the center of all thought, the center of all thought, learninglearning and and memorymemory

Functions of the Nervous Functions of the Nervous SystemSystem

1.1. the center of all thought, the center of all thought, learninglearning and and memorymemory

2.2. regulates and maintains regulates and maintains homeostasishomeostasis (a (a state of state of balancebalance))

examplesexamples: body: body temperature, temperature, heart rate, heart rate, respiration, respiration, digestiondigestion

Functions of the Nervous Functions of the Nervous SystemSystem

1.1. the center of all thought, the center of all thought, learninglearning and and memorymemory2.2. regulates and maintains homeostasis (a state of regulates and maintains homeostasis (a state of

balance)balance)examplesexamples: body : body temperature, heart temperature, heart rate, respiration, rate, respiration, digestiondigestion

3.3. keeps us in touch keeps us in touch with our with our internalinternal and and external external environmentenvironment

Central Nervous SystemCentral Nervous System

1.1. Made up of Made up of brainbrain and and spinal cordspinal cord

Central Nervous SystemCentral Nervous System

1.1. MadeMade up of up of brainbrain and and spinal cordspinal cord

2.2. Three main parts of brain:Three main parts of brain:a)a) CerebrumCerebrum- interprets input from - interprets input from sensessenses

and controls and controls voluntaryvoluntary muscles muscles

Central Nervous SystemCentral Nervous System

1.1. MadeMade up of up of brainbrain and and spinal cordspinal cord

2.2. Three main parts of brain:Three main parts of brain:a)a) CerebrumCerebrum- - interprets input from interprets input from senses senses and and

controls controls voluntaryvoluntary muscles muscles

b)b) CerebellumCerebellum- - coordinates actions coordinates actions of of musclesmuscles and and helps keep your helps keep your balancebalance

Central Nervous SystemCentral Nervous System

1.1. MadeMade up of up of brainbrain and and spinal cordspinal cord2.2. Three main parts of brain:Three main parts of brain:

a)a) CerebrumCerebrum- - interprets input from interprets input from senses senses and and controls controls voluntaryvoluntary muscles muscles

b)b) CerebellumCerebellum- - coordinates actions coordinates actions of of muscles muscles and helps and helps keep your keep your balancebalance

a)a) BrainstemBrainstem- controls - controls homeostasishomeostasis and and coordinatescoordinates involuntaryinvoluntary musclesmuscles

What is this part of the brain What is this part of the brain called?called?

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a)a) CerebrumCerebrumb)b) CerebellumCerebellumc)c) Brain Brain

stemstemd)d) Spinal Spinal

cordcord

What is the function of the brain What is the function of the brain stem?stem?

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a)a) Controls homeostasis Controls homeostasis & voluntary muscles& voluntary muscles

b)b) Controls senses & Controls senses & voluntary musclesvoluntary muscles

c)c) Controls balance & Controls balance & coordinates musclescoordinates muscles

d)d) Controls homeostasis Controls homeostasis & involuntary muscles& involuntary muscles

When you feel hungry, what function is When you feel hungry, what function is your nervous system trying to carry out?your nervous system trying to carry out?

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a)a) Maintaining Maintaining homeostasishomeostasis

b)b) Moving your bodyMoving your bodyc)c) Sensing your Sensing your

environmentenvironmentd)d) Keeping your Keeping your

balancebalance

Nerve CellsNerve Cells

Nerve cells are called Nerve cells are called neuronsneuronsImpulseImpulse- a - a messagemessage carried by a neuron carried by a neuronSynapseSynapse- the small space that an impulse - the small space that an impulse jumps jumps between neuronsbetween neurons

Types of NeuronsTypes of Neurons

1.1. SensorySensory neurons: neurons: can sense pressure, can sense pressure, temperature, pain, and 5 sensestemperature, pain, and 5 senses

  

in in skin, muscles, jointsskin, muscles, joints and sense organs and sense organs (nose, tongue, eyes, ears)(nose, tongue, eyes, ears)

Types of NeuronsTypes of Neurons

2.2. Motor Motor neurons: neurons: stimulatestimulate muscle cellsmuscle cells throughout the bodythroughout the body

includes muscles of the includes muscles of the heartheart, , diaphragmdiaphragm, , intestines, and bladderintestines, and bladder

Types of NeuronsTypes of Neurons

3.3. InterneuronsInterneurons:: connectconnect other neuronsother neurons

allall neurons in the neurons in the centralcentral nervous system nervous system (brain, spinal cord) are interneurons(brain, spinal cord) are interneurons

Types of NeuronsTypes of Neurons

ReflexReflex- an - an involuntaryinvoluntary response to a response to a stimulusstimulus (change in environment) (change in environment) that allows the body to that allows the body to respond quickly without respond quickly without thinking about itthinking about it

What is an impulse?What is an impulse?

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a)a) A nerve cellA nerve cellb)b) A message carried A message carried

by neuronsby neuronsc)c) The space between The space between

two neuronstwo neuronsd)d) A reflexA reflex

What is this structure called?What is this structure called?

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a)a) AxonAxonb)b) Synaptic Synaptic

terminalterminalc)c) NucleusNucleusd)d) Dendrite Dendrite

What does a motor neuron What does a motor neuron stimulate?stimulate?

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a)a) Brain cellsBrain cellsb)b) Sensory organsSensory organsc)c) Muscle cellsMuscle cellsd)d) Sensory neurons Sensory neurons

Which is not true about a reflex?Which is not true about a reflex?

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a)a) It is a quick It is a quick response.response.

b)b) It is voluntary.It is voluntary.c)c) It does not require It does not require

conscious thought.conscious thought.d)d) It is a response to It is a response to

an external an external stimulus.stimulus.