A small fluid-filled sac that reduces friction between adjacent structures of the body that move along each other is a(n):

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A bursa is a small fluid-filled sac that provides cushioning and reduces friction between adjacent structures of the body that move along each other. Muscles are contractile tissues that produce movement, aponeuroses are flat, sheet-like tendons that attach muscles to bone or other structures, and ligaments are bands of connective tissue that attach bones to other bones.

A Small Fluid-Filled Sac That Reduces Friction Between Adjacent Structures