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- W3145256475 abstract "The influence of osmolality of the external medium on the calcium (Ca) dependency of contractility of isolated electrically excited cat papillary muscle was examined. Maximum unloaded velocity of shortening was directly measured by load clamping the muscle from the preload (at the length, Lmax, at which maximum active tension was developed) to zero load (zero load clamp). Peak velocity of shortening at the Lmax preload, peak total force, peak rate of force development, time to peak force, and time to half relaxation were also recorded. The performance-Ca response curves (Ca concentration between 1.25 nM and 10 nM) for maximum unloaded velocity of shortening, peak shortening velocity at Lmax preload, total force, and peak rate of force development were shifted to the left when osmolality was increased (from 290 mosmoles to 410 mosmoles) with sucrose, and to the right when osmolality was increased with NaCl. The sensitivity for Ca, as determined from the slopes of these response curves, appeared essentially..." @default.
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- W3145256475 date "1975-01-01" @default.
- W3145256475 modified "2023-09-24" @default.
- W3145256475 title "Contractility in mammalian heart muscle; calcium and osmolality." @default.
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