![]() Too much force stimulates tendon organs and causes decreasing motor discharge to the respiratory muscles and may prevent the muscles from damaging themselves. Tendon organs, another receptor in muscles, monitor changes in the force produced by muscle contraction. Receptors, called spindles, in the respiratory muscles measure muscle length and increase motor discharge to the diaphragm and intercostal muscles when increased stiffness of the lung or resistance to the movement of air caused by disease impedes muscle shortening. Generally there is a length at which the force generated is maximal. These receptors are particularly important when lung function is impaired, since they can help maintain tidal volume and ventilation at normal levels.Ĭhanges in the length of a muscle affect the force it can produce when stimulated. Receptors in the respiratory muscles and in the lung can also affect breathing patterns.
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