. Comparative animal physiology. Physiology, Comparative; Physiology, Comparative. —I 1 1 1 1 1—I 1 i Fis- 2H2. Tension curves of snail retractor pharynx. In each curve the muscle was first stimulated, then after relaxation it was stretched by about 10 per cent of its length and then released. A, in air; B, in air and 6 per cent COj. Time in seconds in each. Note .similarity of and release of tension. From Bozler.''' from continued discharge of motor impulses at low rates in a variable num- ber of motor units. Relaxation is complete when such nervous discharge ceases. In insects th
. Comparative animal physiology. Physiology, Comparative; Physiology, Comparative. —I 1 1 1 1 1—I 1 i Fis- 2H2. Tension curves of snail retractor pharynx. In each curve the muscle was first stimulated, then after relaxation it was stretched by about 10 per cent of its length and then released. A, in air; B, in air and 6 per cent COj. Time in seconds in each. Note .similarity of and release of tension. From Bozler.''' from continued discharge of motor impulses at low rates in a variable num- ber of motor units. Relaxation is complete when such nervous discharge ceases. In insects the contracted state in death feigning results from con- tinued nervous acti\it\. That there is some "setting" or organization of me- chanical elements in striated muscle is shown by the observation^''-^ that, if the muscle is suddenly either released or stretched during continued isometric contraction, tension is again developed over a time course corresponding to its new length. The tension developed by an excited muscle depends on the initial length of that muscle and is maximal at the resting length.^•'*^ Short-Hbered smooth muscle is sometimes said to have no fixed resting length. The tension in the mammalian bladder and in the gastral cavity of a sea , in the coelom of Sipiincidus, or in the gill cavity of an as- cidian, is rclati\ely constant, whether the cavity be empty or full. The mus- cles are stimulated by stretching. Many hearts likewise are stimulated to. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Prosser, C. Ladd (Clifford Ladd), 1907-; Bishop, David W. Philadelphia, Saunders
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