Practice Exam Muscle

1. The molecule that stores oxygen in skeletal muscle is

a. hemoglobin b. myosin c. actin

d. myoglobin e. lactic acid


2. The neurotransmitter released at the neuromuscular junction

a. acetylcholine b. acetylcholine esterase c. synaptic cleft d. calcium


3. All muscle tissue has all the following properties except:

a. excitability. b. contractility. c. extensibility d. automaticity (pacemaker)

4. Which of the following is not a usual result of exercise?

a. increase in efficiency of the respiratory system

b. increase in the number of muscle cells

c. increase in the efficiency of the circulatory system

d. hypertrophy of muscle fiber.


5. In muscle contraction, calcium acts to:

a. increase the action potential transmitted along the sarcolemma

b. release the inhibition on Z‑lines.

c. remove the action of acetylcholine.

d. initiate the formation of cross bridges.


6. An elaborate network of membranes in skeletal muscle cells that functions in calcium storage is the:

a. sarcoplasmic reticulum. b. T-tubules.

c. intermediate filament network d. endomysium.


7. Creatine phosphate functions in the muscle cell by:

a. forming a temporary chemical compound with myosin.

b. forming a chemical compound with actin.

c. storing energy which will be transferred to ADP to make ATP as needed.

d. releasing calcium.


8. After nervous stimulation of the muscle cell has ceased, the calcium:

a. is destroyed by cholinesterase. b. is chemically bound to the filaments.

c. is removed from the cell or stored until the next contraction.

d. is transferred to calmodulin.

9. Which of the following is composed of myosin?

a. thick filaments b. thin filaments c. all myofilaments d. Z‑line


10. Muscle tone is:

a. a state of sustained partial contraction.

b. the feeling of well being following exercise.

c. the ability of a muscle to efficiently cause skeletal movements.

d. the condition of athletes after intensive training.


11. Which of these surrounds the individual muscle cell?

a. perimysium b. endomysium c. epimysium d. fascicle


12. Which of the following is not usually associated with a lever system?

a. fulcrum b. effort d. load c. synarthotic joint

e. All of these are associated with lever systems.


13. Which of the following muscles acts in plantar flexion?

a. gastrocnemius b. rectus femoris c. latisamus dorsi

d. trapezius e. All these.


14. The muscle that is responsible for bringing about a particular movement.

a. antagonist b. prime mover c. fixator d. synergist


15. A muscle named 'biceps' is named for the

a. direction of muscle fibers b. number of origins

c. shape of the muscle d. muscle action


16. The attachment of a muscle to the movable bone is the

a. insertion b. origin c. antagonist d. agonist


17. The phase of contraction that refers to the period of time when a muscle does not respond to a second stimulus is the

a. latent b. contraction

c. relaxation d. refractory


18. In which type of muscle tissue would you find dense bodies?

a. skeletal b. smooth c. cardiac


19. The release of this element plays a key role in muscle contraction.

a. oxygen b. sodium c. calcium d. iron


20. A sarcomere is the area:

a. of the H zone b. containing only thick myofilaments

c. containing only thin myofilaments d. between two Z lines


21. In a fully contracted muscle the sarcomere is approximately the length of the

a. thin myofilaments b. A band c. H zone d. I band


22. Which of the following is not required for muscle contraction?

a. action potential b. calcium

c. acetylcholine d. acetylcholinesterase


23. The of skeletal muscle fiber is the cell's plasma membrane.

a. sarcoplasm b. sarcolemma

c. transverse tubules d. myofibrils


24. Which layer of connective tissue covers a fascicle?

a. perimysium b. epimysium c. endomysium d. fascia



Answer Key for Muscle Practice exam