od vessels and nerves of the tendon.
Aponeuroses are flattened, ribbon-like tendons, similar in structure to tendons, with very few blood vessels (Ross, Romrell and Kaye, 1995, 96). They differ from tendons only in being flatter and thinner. The fibers in aponeuroses are arranged in multiple layers, with the bundles of collagen in one layer being at 90 degrees to the bundles of collagen in the next layer. The fibers within each layer are arranged in regular arrays, forming dense regular connective tissue.
3. What is the importance of acetylcholinesterase in muscle cell contraction?
Acetylcholinesterase is an enzyme which breaks down the neurotransmitter, acetylcholine, and is important in muscle cell contraction, because if the acetylcholine was not broken down, the muscle would continue being stimulated and would stay contracted, resulting in tetany, i.e. the muscle would cramp, and would not relax (Ross, Romrell and Kaye, 1995, 223).
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