resp physiology Q7

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what generate a normal cyclic pattern of respiration?

the pons and medulla in the brain.

pattern pf respiration is altered by

(homeostatic) and (adaptive) reflexes.

describe the feedback mechanism if there's an increase of Pco2/or decreased pO2.

chemoreceptors in carotid body will detect this change>send signal to the respiratory control centre (medulla,pons)>send signal to resp muscle>increased frequency of depth of breathing.

describe the role of DRG (dorsal resp group) during normal quiet inhalation.

DRG will be active, send signals in 2 sec for inhalation, diaphragm and will contract and external intercostal muscle contract>normal quite inhalation. Signup and view all the answers

whats the role of the DRG in normal quite exhalation.

the DRG will be inactive (3sec), no signals, diaphragm relaxes and the external intercostal muscles relax, elastic recoil of lungs>normal quite exhalation. Signup and view all the answers

describe the role of DRG during forceful inhalation.

DRG send signals so diaphragm and external ... contracts> DRG also activates VRG (forceful inhalation neurons)>DRG will activate the accessory muscles of inhalation (eg pectoralis minor) so they contact>forceful inhalation. Signup and view all the answers

the role of VRG during forceful exhalation.

send signals to the accessory muscle of exhalation (abdominis muscles, external oblique and etc) so they contract, forceful exhalation. Signup and view all the answers

neurones involved in forceful inhalation/exhalation

VRG Signup and view all the answers

neurones involved in inhalation but not in exhalation

DRG Signup and view all the answers

voluntary hyper/hypo ventilation is controlled by

cerebral cortex. Signup and view all the answers

Normal Respiration Pattern

The rhythmic cycle of breathing, regulated by the pons and medulla in the brain.

Factors altering Respiratory Pattern

Homeostatic and adaptive reflexes adjust the breathing pattern.

Increased CO2/Decreased O2 Feedback

Chemoreceptors detect changes in CO2 or O2 levels. Signal is sent to respiratory centers that increase breathing rate and/or depth.

DRG (Dorsal Respiratory Group) Quiet Inhalation

DRG activates for 2 seconds, signaling diaphragm and external intercostal muscles to contract, causing inhalation.