Muscular System Practice Quiz #1

Last Modified: October 19, 2000 (J. Crimando).

Muscular System Practice Quiz:

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1. A muscle fascicle is a bundle of:

a) myofibrils

b) fibers

c) filaments

d) fascia

2. The connective tissue wrapping around a muscle that is continuous with tendons is the:

a) perimysium

b) endomysium

c) epimysium

d) sarcolemma

3. Which of the following is NOT a major function of muscle tissue:

a) produce body heat

b) body movements

c) controlling volume of hollow organs

d) storage of neurotransmitters

4. What is the smallest unit of contraction in muscle fibers:

a) sarcomere

b) sarcolemma

c) sarcoplasm

d) sarcofilament

5. In muscle tissue, neurotransmitter receptors are located:

a) in synaptic vesicles

b) in the synaptic cleft

c) on the motor neuron axon terminals

d) on the motor end plate

6. An action potential is:

a) a migrating region where the electrochemical potential of a membrane undergoes reversal

b) a flow of electrons from one cell to another

c) an electrically charged molecule such as sodium or potassium ions

d) a region where the electrochemical gradient of a membrane causes acetylcholine production

7. Acetylcholinesterase:

a) produces acetylcholine

b) is the acetylcholine receptor in muscle tissue

c) binds to the acetylcholine receptor in muscle tissue

d) degrades acetylcholine

8. Tetanus toxin causes convulsive paralysis by:

a) binding to acetylcholine receptor and blocking acetycholine

b) inhibiting acetylcholine esterase

c) causing massive acetylcholine release from motor neurons

d) blocking nearly all acetylcholine release from motor neurons

9. A person suffering from nerve gas exposure is given atropine to counteract the effects. Why?:

a) atropine will bind to nerve gas and help inactivate

b) atropine will block the sites where nerve gas acts

c) atropine blocks acetylcholine receptor which blocks the excess acetycholine lingering in the synaptic cleft

d) atropine will inactivate acetylcholine esterase and allow more acetylcholine to cross the synaptic cleft

10. Which of the following statements is FALSE:

a) all muscle tissue acts by contraction only

b) of the three types of muscle tissue, only skeletal is voluntary

c) superficial fascia holds skin to muscle

d) muscles use the skeletal system as leverage points by pushing against the bones to produce body movement