Figure 6 (below) shows tidal volume tracings (the peaks on the right) obtained f

Question

Figure 6 (below) shows tidal volume tracings (the peaks on the right) obtained from animals with various brain areas severed. The tracings illustrate the role each of the centres of the brain has in controlling breathing. WARNING: This is a difficult exercise and you will have to think about what happens with each cut (in answering the questions below with reference to Fig 5 and the associated text). BOTH VAGUS NERVES INTACT FIRST CUT SC SUIPER LICULI NERVES CUT SECOND CUT INFER LLICULI NBUMOTAX CENTRE 2 PNBUSTIC CENTRE THIRD CUT DRG VRG FOURTH CUT SPINAL CORD Figure 6: Tidal volume tracings with sectioning of the nervous system

Explanation / Answer

Apneustic center of respiration is present in the pons. It sends impulses to the dorsal respiratory group of neurons in medulla thereby stimulating inspiration. Therefore, the transection below the apneustic center results in irregular respiratory rhythm as the respiration is maintained with slight irregularity.

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