Inspiration – Diaphragm and intercostals muscles contract resulting in increased volume and decreased pressure in the thoracic cavity; air rushes in
Expiration – Diaphragm and intercostals muscles relax resulting in decreased volume and increased pressure in the thoracic cavity; air pushed out
disorders, and chronic obstructive pulmonary disease (COPD). Hypoventilation and oxygen desaturation deteriorate during sleep secondary to a decrement in ventilatory response to hypoxia and increased PaCO2. In addition, diminished muscle tone develops during the rapid eye movement (REM) stage of sleep, which further exacerbates hypoventilation secondary to insufficient respiratory effort.
Pain의 기전
VISCERAL PAIN
Visceral pain is transmitted by C fibers that are found in muscle, periosteum, mesentery, peritoneum, and viscera. Most painful stimuli from abdominal viscera are conveyed by this type of fiber and tend to be dull, cramping, burning, poorly localized, and more gradual in onset and longer in duration than somatic pain. Because abdominal organs transmit sensory af
muscle이 수축하여 lung volume을 증가시키므로 대기압보다 약간 낮은 압력 -3mmHg를 형성하여 공기가 자연히 흘러 들어가게한다. 흡기가 끝나면 흡기시 사용되었던 근육과 횡격막이 원래의 형태로 돌아가 흉곽의 크기를 감소시켜 +3mmHg정도의 압력을 형성함으로 공기가 기도밖으로 빠져나오게 된다. 흉곽은
실험 목적
Forced expiratiory volume과 Maximal voluntary ventilation을 측정하고 이를 비교 분석해 본다.
실험 이론
1. 폐용적과 용량
1) 폐용적 (Lung Volume) - 폐환기의 규모는 폐용적에 의해 결정
일회흡용적(Tidal volume) : 안정상태에서 일회 호흡하는 동안 들이마시거나 내쉬는 공기의 양(정상