Comment on the sequences of events during the regulation of respiration.
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The regulation of respiration is usually brought about with the help of:Neural mechanism.
Chemical influence.
Non-chemical influence.
The chemical and non-chemical influences usually act with the help of neural mechanism. The sequence of events during regulation of respiration through neural mechanism are as follows:
Due to the ramp generator there is an onset and gradual increase in the production of the number of impulses in the inspirator center.Which leads to:The impulses are sent from IC to spinal cord for the stimulation of phrenic and intercostals nerves.Reciprocal inhibition of expiratory center by IC.1.Excitatory impulses are sent from IC to pneumotaxic center with the help of multisynaptic pathway.
2.When inspiration is taking place, you will find a gradual inhibition of the apneustic center due to the impulses that come from pneumotaxic center. It also comes from afferent vagal fibers of the distended alveoli.
3.The influence of Apneustic center over IC ceases completely. Hence the activity stops at the inspiratory center and leads to no inhibition influence over the expiratory center. There are no further impulses sent from the inspiratory center to motor neurons of the spinal cord.
4.The inspiration muscles then start relaxing. This begins the procedure of expiration which generally last for about 3 sec.
5.After this, the activity again begins in IC that leads to the next respiratory cycle.
Chemical influence.
Non-chemical influence.
The chemical and non-chemical influences usually act with the help of neural mechanism. The sequence of events during regulation of respiration through neural mechanism are as follows:
Due to the ramp generator there is an onset and gradual increase in the production of the number of impulses in the inspirator center.Which leads to:The impulses are sent from IC to spinal cord for the stimulation of phrenic and intercostals nerves.Reciprocal inhibition of expiratory center by IC.1.Excitatory impulses are sent from IC to pneumotaxic center with the help of multisynaptic pathway.
2.When inspiration is taking place, you will find a gradual inhibition of the apneustic center due to the impulses that come from pneumotaxic center. It also comes from afferent vagal fibers of the distended alveoli.
3.The influence of Apneustic center over IC ceases completely. Hence the activity stops at the inspiratory center and leads to no inhibition influence over the expiratory center. There are no further impulses sent from the inspiratory center to motor neurons of the spinal cord.
4.The inspiration muscles then start relaxing. This begins the procedure of expiration which generally last for about 3 sec.
5.After this, the activity again begins in IC that leads to the next respiratory cycle.
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