Action Potential
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Animal Behavior
Intro, Nervous System
Intro to Animal Behavior (p. 813, ch.33) • This armadillo is jumping after hearing a loud noise • Behavior is a response to a stimulus – What is the stimulus? – What is the response?
Animal Behavior
Intro, Nervous System
Behavior Overview • Animals behavior comes from the nervous system – Nerves carry sensory and motor signals – Brain and spinal cord connect and process signals – Like a computer, telephone, or TV
Where is stimulus? Where is response?
Animal Behavior
Intro, Nervous System
What actually happens:
•
Can you find these features in the diagram? ___ Response
___ Motor signals
____ Integration
____Stimulus
_____ Sensory signal
_____Spinal cord
Animal Behavior
Intro, Nervous System
Anatomy of a Neuron -- p. 945 - 949 Animals send nerve signals travel through neurons. neurons - neurons carry electric & chemical signals - signal goes one way: in at dendrites, out through axon Important parts: •Dendrites •Cell body •Axon •Terminals •Synapses
Animal Behavior
Intro, Nervous System
Label this neuron: • Axon • Cell body • Dendrites • Terminals
Animal Behavior
Intro, Nervous System
Nerve signal (impulse) occurs when ions move in and out of neurons. • Step 1: “Resting Potential” – Neuron is waiting for signal – More Na+ is on the outside
Animal Behavior
Intro, Nervous System
Step 2: Stimulus starts an “Action Potential” • Na+ moves into neuron + inside, - outside
• Signal moves like a wave through axon
Animal Behavior
Step 3: “Repolarization” • After signal, Na+ moves back out Neuron returns to “resting potential”
Intro, Nervous System
Animal Behavior
Intro, Nervous System
Reviewing Nerve Impulse Which of these is written in the proper order? A) resting potential, repolarization, action potential B) action potential, resting potential, repolarization C) resting potential, action potential, repolarization
Animal Behavior
Intro, Nervous System
Action Potential Identify these points: • Repolarization • Resting potential • Action Potential
Animal Behavior
Intro, Nervous System
Neurons, Energy, and Ions •
Neurons must constantly pump ions across the membrane --> requires huge amounts of energy (sugar, oxygen --> ATP energy) •
•
If breathing stops, neurons fail first (brain)
Ions lost through sweat must be replaced •
Gatorade better than water after heavy sweat
Intro, Nervous System
Intro to Animal Behavior (p. 813, ch.33) • This armadillo is jumping after hearing a loud noise • Behavior is a response to a stimulus – What is the stimulus? – What is the response?
Animal Behavior
Intro, Nervous System
Behavior Overview • Animals behavior comes from the nervous system – Nerves carry sensory and motor signals – Brain and spinal cord connect and process signals – Like a computer, telephone, or TV
Where is stimulus? Where is response?
Animal Behavior
Intro, Nervous System
What actually happens:
•
Can you find these features in the diagram? ___ Response
___ Motor signals
____ Integration
____Stimulus
_____ Sensory signal
_____Spinal cord
Animal Behavior
Intro, Nervous System
Anatomy of a Neuron -- p. 945 - 949 Animals send nerve signals travel through neurons. neurons - neurons carry electric & chemical signals - signal goes one way: in at dendrites, out through axon Important parts: •Dendrites •Cell body •Axon •Terminals •Synapses
Animal Behavior
Intro, Nervous System
Label this neuron: • Axon • Cell body • Dendrites • Terminals
Animal Behavior
Intro, Nervous System
Nerve signal (impulse) occurs when ions move in and out of neurons. • Step 1: “Resting Potential” – Neuron is waiting for signal – More Na+ is on the outside
Animal Behavior
Intro, Nervous System
Step 2: Stimulus starts an “Action Potential” • Na+ moves into neuron + inside, - outside
• Signal moves like a wave through axon
Animal Behavior
Step 3: “Repolarization” • After signal, Na+ moves back out Neuron returns to “resting potential”
Intro, Nervous System
Animal Behavior
Intro, Nervous System
Reviewing Nerve Impulse Which of these is written in the proper order? A) resting potential, repolarization, action potential B) action potential, resting potential, repolarization C) resting potential, action potential, repolarization
Animal Behavior
Intro, Nervous System
Action Potential Identify these points: • Repolarization • Resting potential • Action Potential
Animal Behavior
Intro, Nervous System
Neurons, Energy, and Ions •
Neurons must constantly pump ions across the membrane --> requires huge amounts of energy (sugar, oxygen --> ATP energy) •
•
If breathing stops, neurons fail first (brain)
Ions lost through sweat must be replaced •
Gatorade better than water after heavy sweat
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