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resp physiology Q6

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Questions and Answers

whats hypercapnia and what does it stimulate

it's a slight increase in Pco2>H+. it stimulates both peripheral(carotid) and central chemoreceptors.

whats hypoxia and what does it stimulate

its oxygen deficiency at tissue level caused by a low Po2 in atrial blood due to airway obstruction or fluid in the lungs. it stimulates the peripheral (carotid) chemoreceptors.

whats the function of lung receptors ( pulmonary mechanoreceptors)?

self regulatory negative feedback as inflation inhibits further inspiratory muscle activity, deflation initiates inspiratory activity.

describe the (HERING-BREUER) inflation reflux.

when lungs are inflated, this is detected by lung stretch receptors>impulses travel via vagus nerve and large myelinated fibres to the brain>slow down the breathing rate to prevent over inflation and protect the lungs. Signup and view all the answers

where the peripheral chemoreceptors located

in carotid and aortic bodies. Signup and view all the answers

peripheral receptors respond to

decreased arterial o2, increased co2, and H+ (rapid responding). Signup and view all the answers

where central chemoreceptors located

near ventral surface of (medulla). Signup and view all the answers

central chemoreceptors r sensitive/respond to

to Co2 but not O2, they respond to the change of pH of the ECF/CSF when co2 diffuse out the cerebral capillaries. Signup and view all the answers

control of respiration involves a basic rhythm generated by

brainstem. Signup and view all the answers

whats (pre-BOTC) and whats its function

Pre-Botzinger complex, a collection of pace-maker cells located at the upper end of Dorsal respiratory group (DRG), it discharges/transmits rhythmic resp signals. Signup and view all the answers

Flashcards

Hypercapnia

A slight increase in carbon dioxide (PCO2) in the blood, leading to an increase in hydrogen ion (H+) concentration.

Hypoxia

Oxygen deficiency in tissues due to low oxygen (PO2) levels in the blood, often caused by lung issues.

Lung Receptors (Pulmonary Mechanoreceptors)

Stretch receptors in the lungs that regulate breathing by sending signals to the brain to adjust breathing rate.

Hering-Breuer Inflation Reflex

A reflex that controls breathing rate to prevent over-inflation of lungs by slowing it down when they're inflated.

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Peripheral Chemoreceptors Location

Located in the carotid and aortic bodies to monitor blood gases and regulate breathing.