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Figure 18-17
The β-adrenoceptor signaling system leads to an
increased rate and force of contraction and increased relaxation. SL, sarcolemma;
SR, sarcoplasmic reticulum. (From Opie LH: Receptors and signal transduction.
In The Heart. Physiology from Cell to Circulation,
3rd ed. Philadelphia, Lippincott-Raven, 1998, p 195.)
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