Question 181 ptsIf a given neuropeptide decreases the amplitude of the slow after-hyperpolarisation (sAHP) in spinal neurons, its effect on lamprey swimming would be:Group of answer choicesbursts of muscle action potentials would be longer and the lamprey would have a slower speed of swimmingbursts of muscle action potentials would be shorter and the lamprey would have a slower speed of swimmingbursts of muscle action potentials would be longer and the lamprey would have a faster speed of swimmingmuscles on both sides of the lamprey would contract simultaneouslymuscle action potentials would fire at a lower frequency within bursts PreviousNext
Question
Question 181 ptsIf a given neuropeptide decreases the amplitude of the slow after-hyperpolarisation (sAHP) in spinal neurons, its effect on lamprey swimming would be:Group of answer choicesbursts of muscle action potentials would be longer and the lamprey would have a slower speed of swimmingbursts of muscle action potentials would be shorter and the lamprey would have a slower speed of swimmingbursts of muscle action potentials would be longer and the lamprey would have a faster speed of swimmingmuscles on both sides of the lamprey would contract simultaneouslymuscle action potentials would fire at a lower frequency within bursts PreviousNext
Solution
The slow after-hyperpolarisation (sAHP) in neurons is a phase that follows an action potential. During this phase, the neuron is less likely to fire another action potential. This is because the membrane potential is more negative (hyperpolarised) than the resting potential, making it harder for the neuron to reach the threshold needed to fire an action potential.
If a neuropeptide decreases the amplitude of the sAHP, it means that the neuron is less hyperpolarised during this phase and therefore more likely to fire another action potential. This would result in longer bursts of muscle action potentials.
The speed of swimming in lampreys is determined by the frequency and duration of muscle action potentials. Longer bursts of action potentials would result in more sustained muscle contractions, which would propel the lamprey through the water at a faster speed.
Therefore, if a given neuropeptide decreases the amplitude of the sAHP in spinal neurons, the effect on lamprey swimming would be that bursts of muscle action potentials would be longer and the lamprey would have a faster speed of swimming.
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