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Multiple Choice
Muscle fibers are arranged in bundles called:
A
Sarcomeres
B
Fascicles
C
Myofibrils
D
Tendons
Verified step by step guidance
1
Step 1: Understand the structure of a muscle. Muscles are composed of multiple layers of organization, starting from the smallest unit (sarcomeres) to larger structures (fascicles).
Step 2: Define the term 'sarcomeres.' Sarcomeres are the smallest functional units of muscle contraction, composed of actin and myosin filaments, but they are not bundles of muscle fibers.
Step 3: Define the term 'myofibrils.' Myofibrils are long, thread-like structures within muscle fibers that contain sarcomeres arranged in series, but they are not bundles of muscle fibers either.
Step 4: Define the term 'fascicles.' Fascicles are bundles of muscle fibers surrounded by connective tissue called perimysium. This is the correct term for the arrangement of muscle fibers in bundles.
Step 5: Define the term 'tendons.' Tendons are connective tissues that attach muscles to bones, but they do not describe the arrangement of muscle fibers in bundles.