. A text-book of human physiology . Fig. —Frogs gastrocnemius, a, isotonic con-traction; b, simple projectile contraction. Bothwere obtained with tlie same loads, 80 g., Fig. 174.—Frogs gastrocnemius. 1, loaded with 4 g., i. e., with the bare lever; 2, 40 g. deadweight; 3, 100 g. dead weight; 4, 200 g. dead weight. so that they contract much more slowly than is normal. The first rapid curve isreferable to the white fibers, the second long-drawn-out cui-ve to the red fibers. SIGNS OF ACTIVITY IN MUSCLE AND NERVE 437 After these preliminary remarks we can proceedwith the di
. A text-book of human physiology . Fig. —Frogs gastrocnemius, a, isotonic con-traction; b, simple projectile contraction. Bothwere obtained with tlie same loads, 80 g., Fig. 174.—Frogs gastrocnemius. 1, loaded with 4 g., i. e., with the bare lever; 2, 40 g. deadweight; 3, 100 g. dead weight; 4, 200 g. dead weight. so that they contract much more slowly than is normal. The first rapid curve isreferable to the white fibers, the second long-drawn-out cui-ve to the red fibers. SIGNS OF ACTIVITY IN MUSCLE AND NERVE 437 After these preliminary remarks we can proceedwith the discussion of the effect of load on the work ofa muscle. We can say in general that the height ofthe contraction is less the greater the load. But thisrule cannot stand without qualification. For underthe isotonic arrangement we find the height less witha very ligrht load than it is with one somewhat heavier(v. Frey), and under the purely auxotonic arrange-ment the height increases with the load up to a fairlyhigh primary tension. Moreover, even if the heightof the contraction does decrease as the load increases,it does so much more slowly than the load increases; sothat up to a certa
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