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Muscles - Test 1


1. Myofibrils are composed of individual:
A. sarcomeres
B. striations
C. myofilaments
D. fascicles


2. Muscles are held in place and covered by:
A. endomysium
B. fascia
C. tendons
D. sarcomeres


3. The functional unit of a muscle is the:
A. neuron
B. reticulum
C. Z line
D. sarcomere


4. Thin filaments within a muscle fiber are called:
A. actin
B. myosin
C. striation
D. sarcolemma


5. This substance will cross the neuromuscular junction to communicate with individual muscle fibers:
A. acetylcholine
B. sarcolemma
C. fascia
D. mitochondria


6. The energy source for muscle contractions is:
A. calcium
B. glucose
C. ATP
D. cholinesterase


7. The A band in a myofibril is an area of:
A. thin filaments
B. thick filaments
C. transverse tubules
D. motor end plates


8. A sarcomere is defined as the section of fiber between:
A. Z lines
B. A lines
C. H zones
D. I Bands


9. Tendons connect:
A. muscles to muscles
B. muscles to neurons
C. bones to bones
D. muscles to bones


10. The connective tissue that surrounds individual muscle fibers is:
A. perimysium
B. epimysium
C. endomysium
D. myomysium






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