Neurobiology 523- SimUText Sections 1-4 with 100% complete solutions already graded A+

what is true regarding the nociceptor? the nociceptor generates action potentials that travel toward the brain when does the spinal cord neuron generate an action potential? after the nociceptor's action potential reaches the end of the nociceptor 00:22 01:28 what part of the nociceptor results in an action potential when hit? the tip of the nociceptor in the finger you can feel a hammer slamming into any part of your hand or arm. how might your brain figure out where the pain is coming from? by determining which nociceptors generate action potentials which statement below is TRUE? - when the neuron's interior is negative compared to its exterior, Vm is negative - when the neuron's interior is positive compared to its exterior, Vm is negative - the neuron's interior always has the same amount of change as its exterior when the neuron's interior is negative compared to its exterior, Vm is negative during the action potential, is Vm the same everywhere throughout the neuron no at the peak of the action potential (highest Vm) is the neuron negatively or positive charged compared to its surroundings? more positively charged what is the Vm for this neuron at rest (a long time after the action potential)? -66 mV what statement below is TRUE about the shape of the action potential along the axon? -- (as the action potentials are transferring along) - the peak Vm of the action potential decreases as it travels to the right - the peak Vm of the action potential remains about the same as it travels to the right - the peak Vm of the action potential increases as it travels to the right the peak Vm of the action potential remains about the same as it travels to the right approx. how long (in ms) does it take the action potential to reach the far (right) side of the neuron after stimulation? 38 ms how does the action potential change as you vary the intensity of the stimulus? the action potential doesn't change, but at very low stimulus intensities there is no action potential (all or nothing!) below the threshold, an action potential is never generated so pain sensation is not transmitted to the brain from this neuron true 00:01 01:28 how do you think the nociceptor indicates the intensity of pain? the intensity of pain is indicated by the number of action potentials an action potential in the motor neuron results in which of the following? - release of neurotransmitter from the motor neuron - a contraction lasting for seconds - a brief twitch-like muscle contraction lasting for a few milliseconds - the perception of pain - release of neurotransmitter from the motor neuron - a brief twitch-like muscle contraction lasting for a few milliseconds MILLISECONDS NOT SECONDS what must occur for the muscle fiber to contract more forcefully? (Hint: Recall how the nociceptor indicated stronger stimuli, and use this idea in the stimulation to see if it works) the motor neuron generates many action potentials in a brief amount of time what does botulinum toxin do? prevents the release of neurotransmitter what statement below is TRUE when lidocaine is applied to the middle of the nociceptor? - the nociceptor does not respond to painful stimuli. an action potential is never generated. - the action potential is not affected by lidocaine applied to the middle of the nociceptor. lidocaine must be applied near the stimulus point to have an effect - the nociceptor does not release neurotransmitter the nociceptor does not release neurotransmitter