University:
Western Sydney University
Course:
MEDI 2003 | Clinical Sciences 2
Academic year:

2024
Views:

232

Pages:

1
Author:

Mariam A. A.

INSPIRATION ~ Mechanics of breathing ~ Left Side (Nervous System & Muscle Action): cerebral cortex AIB cerebellum HB PONS medulla VRC C₃, C₄, C₅ T₁ - T₁₁ Push sternum anteriorly & up -> anteriorly ↑ thoracic cavity vol Rib pull outwards -> ↑ contract intercostal nerve phrenic nerve Center (Lungs & Pressures): 760 mmHg visceral pleura parietal pleura P alv = 0 mmHg P ip = -5 cmH₂O P transpulmonary = +5 cmH₂O P alv = -1 mmHg (759 mmHg) BC -> Intra-wall pressure -> distend alveoli (Intrapulmonary pressure) TP -> P alv - P ip -> -1mmHg - (-6 mmHg) -> +5 mmHg Elm -> measures elastic forces -> 760 mmHg / 10 mmHg Transpleural pressure -> (C-charge cavity) -> -5 mmHg -> +4 used for reading volumes measures suction around -> -1 mmHg -> coming no air being from atmosphere into it no -> use the way some Top Right (Ribs): Contraction pull rib up & out pull sternum up towards origin sternum vertebra Bottom Section: (Diaphragm) depresses ↓ ↑ thoracic cavity V more air taken in as more is required so air keeps flowing until -20 ↓alpalv -1mmHg -> -2 mmHg (758?) Forced Inspiration sternocleidomastoid scalenes (anterior, middle & posterior) pectorals minor ↑↑↑ thoracic V more than normal -> ↓dd pressure ↓ P ip -> -6 mmHg -> -7 mmHg