Applied anatomy and kinesiology; the mechanism of muscular movement . pula in coughing, but there seems to be nouniform manner of moving it, some lifting it, some adducting thelower angle, and some adducting the whole scapula. The trapeziusacts in some cases and the rhomboid in others; it looks more likea diffuse spread of impulses than a coordinated action. In expira-tion with gradually increasing force the rectus abdominis can be feltto act first, the others joining as the force increases. In normal breathing the lungs are protected from injury thatmight be produced through sudden and great
Applied anatomy and kinesiology; the mechanism of muscular movement . pula in coughing, but there seems to be nouniform manner of moving it, some lifting it, some adducting thelower angle, and some adducting the whole scapula. The trapeziusacts in some cases and the rhomboid in others; it looks more likea diffuse spread of impulses than a coordinated action. In expira-tion with gradually increasing force the rectus abdominis can be feltto act first, the others joining as the force increases. In normal breathing the lungs are protected from injury thatmight be produced through sudden and great changes in air-press-ure by the manner in which the movements are performed. Asmay be seen in the record showTi in Fig. 143, the ribs are raisedslowly at first, gradually coming to the most rapid inhalation, andthen gradually slowing down, the inspiration ceasing when thereis only the slightest movement being made. Although expirationin quiet breathing is said to be without muscular action, yet it iscontrolled, as the record shows, in the same way, and this must be.
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