Graded Potentials and Action Potential Generation - Test 3
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| What is a graded potential? | A subthreshold electrical stimuli that does not produce a true action potential, but does generate electrical signals
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| What types of stimuli are there? | Electrical, Chemical, and Mechanical
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| How many types of physiochemical disturbances does stimuli produce and what are they? | 2 Types: 1. local, graded, nonpropagated potentials called Receptor or Generator potential AKA Synaptic potentials or Electrotonic Potentials 2. Action potentials (complete depolarization or nerve impulse)
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| True or False, Graded potentials are conducted with decrement? | True, Decrement think DECREASE. They decrease in magnitude the further they get from the origin.
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| Why does decrement occur in graded potentials? | Because charges are lost due to leaky channels as the potential is conducted
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| How far can a graded potential travel? | 1-2 mm
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| True or false, Graded potentials serve as the only communication in some neurons? | True
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| Name the 4 types of Graded Potentials? | 1. Receptor or Generator Potentials 2. Pacemaker Potential 3. Post synaptic Membrane Potential 4. End Plate Potential
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| Sensory Receptors respond to stimuli from: | 1. Mechanoreceptors (movement) 2. Thermoreceptors (temp) 3. Nocioreceptors (pain) 4. Chemoreceptors (Chemical) 5. Electromagnetic Receptors (Vision)
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| Graded potentials from stimuli are called? | Receptor Potentials
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| True or False, Graded potentials are responsible for cardiac automaticity? | True, due to the Pacemaker Potential
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| What type of graded potential develops at the neuromuscular junction? | End Plate Potential
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| True or False, the size and shape of action potentials are not influenced by the size of the stimulus? | True
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| True or False, Action Potentials require specific voltage gated ion channels? | True
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| Can action potentials occur in all regions of the cell membrane? | No, just the portions that are electically exciteable
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| What is the duration of an action potential? | 1 - 5 msec
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| What senses are dependant upon action potentials? | Sight, Hearing, and Touch
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| What are the 3 Stages of Action Potentials? | 1. Resting or Polarized Stage 2. Depolarization Stage 3. Repolarization Stage
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| What is the resting membrane potential for Nerves? Heart Pacemaker? Skeletal Muscle? | Nerves = -90mv Heart Pacemaker = -60mv Skeletal Muscle = -83 mv
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| In what stage of the action potential do Na+ ions flow into the cell? | Depolarization Stage
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| In what stage of the action potential do K+ ions flow out of the cell? | Repolarization
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| What is overshoot described as in the action potential generation? | The point at which the membrane potential becomes positive.
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| What is happening during repolarization? | Na+ channels are inactivated and K+ are opened
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| True or false, the K+ voltage gate has both fast and slow gates? | False, K+ has a single slow gate whereas Na+ has both.
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| What is the refractory period? | The time when it is either impossible or more difficult to generate a second action potential
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| What is absolute refractory? | The period in which the voltage gated channels have not reset and therefore do not respond to stimulation
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| What is relative refractory? | This is during the period positive after potential in which the cell is hyperpolarized and is more diffficult to generate a second potential
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| What is voltage Inactivation? | A cell membrane is maintained at a voltage potential above threshold and the voltage gated channels are not reset then action potentials can not be generated
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| What is accomodation to slow depoalarization? | This is what happens when a slow depolarizaion occurs which does not cause the voltage gated channels to respond and in turn does not produce an action potential.
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