your parther to nd your lab partner have prepared a frog nerve for gatnering data on action potentiaiS. You connect an electronic stim ally increase the voltage until you see an action potential. Your partner says that the voltage knob is stuck and will not increase the voltage. To finally get an action tial, they begin to trouble shoot and instead of increasing the voltage, they begin to simulate the nerve over and over again and see an action potential. What type of nation is this describing? lator to the nerve and action potentials graded potentials spatial summation temporal summation threshold

Human Anatomy & Physiology (11th Edition)
11th Edition
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Author:Elaine N. Marieb, Katja N. Hoehn
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Chapter1: The Human Body: An Orientation
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**Experiment Description**

You and your lab partner have prepared a frog nerve for gathering data on action potentials. You connect an electronic stimulator to the nerve and ask your partner to gradually increase the voltage until you see an action potential. Your partner says that the voltage knob is stuck and will not increase the voltage. To finally get an action potential, they begin to troubleshoot and instead of increasing the voltage, they begin to stimulate the nerve over and over again and see an action potential. What type of summation is this describing?

**Answer Options:**

- ○ Action potentials
- ○ Graded potentials
- ○ Spatial summation
- ○ Temporal summation
- ○ Threshold

**Explanation of Concepts:**

- **Action potentials** are electrical impulses that allow neurons to communicate. They are all-or-nothing events.
- **Graded potentials** are changes in membrane potential that vary in size, as opposed to all-or-nothing.
- **Spatial summation** involves multiple presynaptic neurons together releasing enough neurotransmitter to exceed the threshold.
- **Temporal summation** occurs when a single presynaptic neuron fires many times in succession, causing the postsynaptic neuron to reach its threshold and fire.
- **Threshold** is the level that a depolarization must reach for an action potential to be initiated.
Transcribed Image Text:**Experiment Description** You and your lab partner have prepared a frog nerve for gathering data on action potentials. You connect an electronic stimulator to the nerve and ask your partner to gradually increase the voltage until you see an action potential. Your partner says that the voltage knob is stuck and will not increase the voltage. To finally get an action potential, they begin to troubleshoot and instead of increasing the voltage, they begin to stimulate the nerve over and over again and see an action potential. What type of summation is this describing? **Answer Options:** - ○ Action potentials - ○ Graded potentials - ○ Spatial summation - ○ Temporal summation - ○ Threshold **Explanation of Concepts:** - **Action potentials** are electrical impulses that allow neurons to communicate. They are all-or-nothing events. - **Graded potentials** are changes in membrane potential that vary in size, as opposed to all-or-nothing. - **Spatial summation** involves multiple presynaptic neurons together releasing enough neurotransmitter to exceed the threshold. - **Temporal summation** occurs when a single presynaptic neuron fires many times in succession, causing the postsynaptic neuron to reach its threshold and fire. - **Threshold** is the level that a depolarization must reach for an action potential to be initiated.
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