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Nervous System Notes | Coordination and Response Notes 4/5

Voluntary Action vs Reflex Action Tuesday, June 4, 2019 6:00 PM More specific - what happens when your hand touches the hot kettle Voluntary Action How does nervous system process info? 1. Sense organ = receptor Receive stimuli 2. Info from sensory receptors Converted into nerve impulses 3. Nerve impulses transmitted by Peripheral nerves to relay to CNS 4. CNS process info Initiate nerve impulse down spine through relay to muscle (effectors) Characteristic of Simple Reflex Arc - Same stimulus produce same response ○ Everytime - Response is rapid and automatic - Don't normally involve parts of brain responsible for conscious thought and decision-making Types of reflex arc 1. Simplest Reflex arc (only 2 neurone, no relay neurone) Eg. Knee jerk reflex Stimulus detected by receptor in sense organ Nerve impulse transmitted along sensory neuron towards CNS In spinal cord, Nerve impulse transmitted across synapse from sensory neurone to motor neurone Nerve impulse transmitted along motor neurone towards the effector muscle Effector muscle contracts Cause leg to kick *** At the synapse, nerve impulse cause release of neurotransmitters Trigger nerve impulse to be sent along relay neuron to brain Keeps brain informed about what is happening 2. Withdrawal reflex arc (at least 3 neuron, got relay neuron) Stimulus detected by receptor in sense organ Nerve impulse transmitted along sensory neuron towards CNS In spinal cord, Nerve impulse transmitted across synapse from sensory neurone to relay neuron, then across synapse to motor neurone Nerve impulse transmitted along motor neurone towards the effector muscle Effector muscle contracts Cause leg to kick When brain overrules, brain send signal to inhibit transmission of impulse from relay neuron to motor neuron And cause muscle to take action decided by brain 2 neuron simple reflex arc vs 3 neuron withdrawal reflex vs conditioned reflex Knee jerk reflex vs withdrawal of hands from hot kettle vs mouth watering when I see cake Voluntary action vs Involuntary action vs reflex action Voluntary - control by brain and conscious will Involuntary - occur w/o conscious effort and Can't be controlled by will (*heartbeat is involuntary but not reflex) Reflex action - coordinated by brain or spinal cord - Cranial reflex (eyes) - Spinal reflex (knee jerk reflex) Voluntary Action vs Reflex Action Tuesday, June 4, 2019 6:00 PM More specific - what happens when your hand touches the hot kettle Voluntary Action How does nervous system process info? 1. Sense organ = receptor Receive stimuli 2. Info from sensory receptors Converted into nerve impulses 3. Nerve impulses transmitted by Peripheral nerves to relay to CNS 4. CNS process info Initiate nerve impulse down spine through relay to muscle (effectors) Characteristic of Simple Reflex Arc - Same stimulus produce same response ○ Everytime - Response is rapid and automatic - Don't normally involve parts of brain responsible for conscious thought and decision-making Types of reflex arc 1. Simplest Reflex arc (only 2 neurone, no relay neurone) Eg. Knee jerk reflex Stimulus detected by receptor in sense organ Nerve impulse transmitted along sensory neuron towards CNS In spinal cord, Nerve impulse transmitted across synapse from sensory neurone to motor neurone Nerve impulse transmitted along motor neurone towards the effector muscle Effector muscle contracts Cause leg to kick *** At the synapse, nerve impulse cause release of neurotransmitters Trigger nerve impulse to be sent along relay neuron to brain Keeps brain informed about what is happening 2. Withdrawal reflex arc (at least 3 neuron, got relay neuron) Stimulus detected by receptor in sense organ Nerve impulse transmitted along sensory neuron towards CNS In spinal cord, Nerve impulse transmitted across synapse from sensory neurone to relay neuron, then across synapse to motor neurone Nerve impulse transmitted along motor neurone towards the effector muscle Effector muscle contracts Cause leg to kick When brain overrules, brain send signal to inhibit transmission of impulse from relay neuron to motor neuron And cause muscle to take action decided by brain 2 neuron simple reflex arc vs 3 neuron withdrawal reflex vs conditioned reflex Knee jerk reflex vs withdrawal of hands from hot kettle vs mouth watering when I see cake Voluntary action vs Involuntary action vs reflex action Voluntary - control by brain and conscious will Involuntary - occur w/o conscious effort and Can't be controlled by will (*heartbeat is involuntary but not reflex) Reflex action - coordinated by brain or spinal cord - Cranial reflex (eyes) - Spinal reflex (knee jerk reflex) Voluntary Action vs Reflex Action Tuesday, June 4, 2019 6:00 PM More specific - what happens when your hand touches the hot kettle Voluntary Action How does nervous system process info? 1. Sense organ = receptor Receive stimuli 2. Info from sensory receptors Converted into nerve impulses 3. Nerve impulses transmitted by Peripheral nerves to relay to CNS 4. CNS process info Initiate nerve impulse down spine through relay to muscle (effectors) Characteristic of Simple Reflex Arc - Same stimulus produce same response ○ Everytime - Response is rapid and automatic - Don't normally involve parts of brain responsible for conscious thought and decision-making Types of reflex arc 1. Simplest Reflex arc (only 2 neurone, no relay neurone) Eg. Knee jerk reflex Stimulus detected by receptor in sense organ Nerve impulse transmitted along sensory neuron towards CNS In spinal cord, Nerve impulse transmitted across synapse from sensory neurone to motor neurone Nerve impulse transmitted along motor neurone towards the effector muscle Effector muscle contracts Cause leg to kick *** At the synapse, nerve impulse cause release of neurotransmitters Trigger nerve impulse to be sent along relay neuron to brain Keeps brain informed about what is happening 2. Withdrawal reflex arc (at least 3 neuron, got relay neuron) Stimulus detected by receptor in sense organ Nerve impulse transmitted along sensory neuron towards CNS In spinal cord, Nerve impulse transmitted across synapse from sensory neurone to relay neuron, then across synapse to motor neurone Nerve impulse transmitted along motor neurone towards the effector muscle Effector muscle contracts Cause leg to kick When brain overrules, brain send signal to inhibit transmission of impulse from relay neuron to motor neuron And cause muscle to take action decided by brain 2 neuron simple reflex arc vs 3 neuron withdrawal reflex vs conditioned reflex Knee jerk reflex vs withdrawal of hands from hot kettle vs mouth watering when I see cake Voluntary action vs Involuntary action vs reflex action Voluntary - control by brain and conscious will Involuntary - occur w/o conscious effort and Can't be controlled by will (*heartbeat is involuntary but not reflex) Reflex action - coordinated by brain or spinal cord - Cranial reflex (eyes) - Spinal reflex (knee jerk reflex) Voluntary Action vs Reflex Action Tuesday, June 4, 2019 6:00 PM More specific - what happens when your hand touches the hot kettle Voluntary Action How does nervous system process info? 1. Sense organ = receptor Receive stimuli 2. Info from sensory receptors Converted into nerve impulses 3. Nerve impulses transmitted by Peripheral nerves to relay to CNS 4. CNS process info Initiate nerve impulse down spine through relay to muscle (effectors) Characteristic of Simple Reflex Arc - Same stimulus produce same response ○ Everytime - Response is rapid and automatic - Don't normally involve parts of brain responsible for conscious thought and decision-making Types of reflex arc 1. Simplest Reflex arc (only 2 neurone, no relay neurone) Eg. Knee jerk reflex Stimulus detected by receptor in sense organ Nerve impulse transmitted along sensory neuron towards CNS In spinal cord, Nerve impulse transmitted across synapse from sensory neurone to motor neurone Nerve impulse transmitted along motor neurone towards the effector muscle Effector muscle contracts Cause leg to kick *** At the synapse, nerve impulse cause release of neurotransmitters Trigger nerve impulse to be sent along relay neuron to brain Keeps brain informed about what is happening 2. Withdrawal reflex arc (at least 3 neuron, got relay neuron) Stimulus detected by receptor in sense organ Nerve impulse transmitted along sensory neuron towards CNS In spinal cord, Nerve impulse transmitted across synapse from sensory neurone to relay neuron, then across synapse to motor neurone Nerve impulse transmitted along motor neurone towards the effector muscle Effector muscle contracts Cause leg to kick When brain overrules, brain send signal to inhibit transmission of impulse from relay neuron to motor neuron And cause muscle to take action decided by brain 2 neuron simple reflex arc vs 3 neuron withdrawal reflex vs conditioned reflex Knee jerk reflex vs withdrawal of hands from hot kettle vs mouth watering when I see cake Voluntary action vs Involuntary action vs reflex action Voluntary - control by brain and conscious will Involuntary - occur w/o conscious effort and Can't be controlled by will (*heartbeat is involuntary but not reflex) Reflex action - coordinated by brain or spinal cord - Cranial reflex (eyes) - Spinal reflex (knee jerk reflex)

Voluntary Action vs Reflex Action

More specific – what happens when your hand touches the hot kettle

 

Voluntary Action

How does nervous system process info?

  1. Sense organ = receptor

Receive stimuli

  1. Info from sensory receptors

Converted into nerve impulses

  1. Nerve impulses transmitted by

Peripheral nerves to relay to CNS

  1. CNS process info

Initiate nerve impulse down spine through relay to muscle (effectors)

 

Characteristic of Simple Reflex Arc

  • Same stimulus produce same response
    • Everytime
  • Response is rapid and automatic
  • Don’t normally involve parts of brain responsible for conscious thought and decision-making

 

Types of reflex arc

  1. Simplest Reflex arc (only 2 neurone, no relay neurone)

Eg. Knee jerk reflex

 

Stimulus detected by receptor in sense organ

Nerve impulse transmitted along sensory neuron towards CNS

In spinal cord, Nerve impulse transmitted across synapse from sensory neurone to motor neurone

Nerve impulse transmitted along motor neurone towards the effector muscle

Effector muscle contracts

Cause leg to kick

 

*** At the synapse, nerve impulse cause release of neurotransmitters

Trigger nerve impulse to be sent along relay neuron to brain

Keeps brain informed about what is happening

 

 

  1. Withdrawal reflex arc (at least 3 neuron, got relay neuron)

 

Stimulus detected by receptor in sense organ

Nerve impulse transmitted along sensory neuron towards CNS

In spinal cord, Nerve impulse transmitted across synapse from sensory neurone to relay neuron, then across synapse to motor neurone

Nerve impulse transmitted along motor neurone towards the effector muscle

Effector muscle contracts

Cause leg to kick

 

 

When brain overrules, brain send signal to

inhibit transmission of impulse from relay neuron to motor neuron

And cause muscle to take action decided by brain

 

2 neuron simple reflex arc vs 3 neuron withdrawal reflex vs conditioned reflex

Knee jerk reflex vs withdrawal of hands from hot kettle vs mouth watering when I see cake

 

Voluntary action vs Involuntary action vs reflex action

Voluntary – control by brain and conscious will

Involuntary – occur w/o conscious effort and Can’t be controlled by will

(*heartbeat is involuntary but not reflex)

Reflex action – coordinated by brain or spinal cord

  • Cranial reflex (eyes)
  • Spinal reflex (knee jerk reflex)

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