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Question 171 ptsInitiation of swimming in a living lamprey requires:Group of answer choicesactivation of circuits by a painful stimulusactivation of reticulospinal pathwaysactivation of vestibular pathwaysinhibition of visual pathwaysactivation of the corticospinal tracts PreviousNext

Question

Question 171 ptsInitiation of swimming in a living lamprey requires:Group of answer choicesactivation of circuits by a painful stimulusactivation of reticulospinal pathwaysactivation of vestibular pathwaysinhibition of visual pathwaysactivation of the corticospinal tracts PreviousNext

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Solution

The initiation of swimming in a living lamprey requires the activation of reticulospinal pathways.

Here's a step-by-step explanation:

  1. The reticulospinal pathways are part of the central nervous system and are responsible for modulating movement.

  2. In lampreys, these pathways are particularly important for initiating and controlling swimming movements.

  3. The reticulospinal neurons in the brainstem send signals down the spinal cord to the muscles that control swimming.

  4. When these pathways are activated, they trigger the rhythmic muscle contractions and relaxations that propel the lamprey through the water.

  5. Therefore, the initiation of swimming in a living lamprey requires the activation of reticulospinal pathways.

Note: The other options listed (activation of circuits by a painful stimulus, activation of vestibular pathways, inhibition of visual pathways, activation of the corticospinal tracts) are not primarily responsible for initiating swimming in lampreys.

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