Abstract
The freeze-etch appearance of the sarcoplasmic reticulum (SR) of fast twitch posterior (PLD) and slow twitch anterior latissimus dorsi (ALD) muscles of the chicken are examined and compared. Particle counts on fractured SR membrane of both adult and posthatch chicks reveal a significantly greater particle density associated with the SR of PLD fibers. The particle density ratio for PLD/ALD SR was found to be approximately 1.6/1 for combined sarcoplasmic (A) and luminal (B) fracture faces of adults and approximately 2.1/1 for the sarcoplasmic (A) face only of posthatch chicks. This study is interpreted as supporting the concept that SR membrane particles represent the calcium-dependent ATPase transfer protein involved in muscle relaxation.
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