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Human Physiology, 7/e
Stuart I Fox, Pierce College
Muscle: Mechanisms of Contraction and Neural Control

Multiple Choice Quiz

Please answer all questions



1

Which type of muscle opposes the action of a levator muscle?
A)Abductor muscle.
B)Depressor muscle.
C)Flexor muscle.
D)Rotator muscle.
2

Which of the following is true regarding the structure of a skeletal muscle?
A)The ligaments connect the muscle to the skeleton.
B)The sarcoplasmic reticulum is continuous with the plasma membrane and forms transverse tubules.
C)The I band contains only thin filaments.
D)The endomysium binds the various fasciculi.
3

During skeletal muscle contraction
A)the width of the H-zone decreases.
B)the actin heads bind to the myosin chain.
C)ATP hydrolysis requires Ca2+ as a cofactor.
D)tropomyosin changes conformation when Ca2+ binds.
4

Which of the following is not a component of a thin filament?
A)actin.
B)myosin.
C)troponin.
D)tropomyosin.
5

During the process of excitation-contraction coupling
A)acetylcholine binds to muscarinic receptors.
B)the transverse tubules release Ca2+ in response to depolarization of the cell through an unknown mechanism.
C)crossbridges form when ATP binds to myosin.
D)release of Ca2+ causes the binding sites on the thin filaments to be uncovered.
6

The amount of tension generated by a skeletal muscle
A)is greatest when the muscle is between 100 and 120% of its optimal resting length.
B)is increased by recruiting more motor units.
C)is increased by summation.
D)all of the above.
7

Damage to the gamma motoneurons would
A)interfere with the muscle stretch reflex.
B)prevent voluntary muscle contraction.
C)induce flaccid paralysis.
D)interfere with the disynaptic reflex.
8

Intention tremor may occur due to damage to the
A)caudate nucleus.
B)red nucleus.
C)cerebellum.
D)motor cortex.
9

During prolonged (90 or more minutes) exercise the preferred energy source for skeletal muscle is
A)plasma glucose.
B)muscle glycogen.
C)plasma fatty acids.
D)muscle triglycerides.
10

High-energy phosphate reserves are maintained in muscles by
A)high concentrations of ATP.
B)high concentrations of glycogen.
C)high concentrations of triglycerides.
D)high concentrations of phosphocreatine.
11

Type IIB skeletal muscle fibers
A)are often referred to as white muscle fibers.
B)are relatively resistant to fatigue.
C)have a high oxidative capacity.
D)have a high myoglobin content.
12

In response to endurance training skeletal muscles will
A)increase the number of type IIB fibers.
B)decrease the concentration of myoglobin.
C)decrease the use of fat as an energy source.
D)decrease the rate of glycogen depletion during exercise.
13

Cardiac muscle is similar to smooth muscle in that both
A)contain striations.
B)are not under conscious control.
C)utilize myosin light-chain kinase.
D)contain dense bodies.
14

Smooth muscle contractions
A)are initiated by binding of Ca2+ to troponin.
B)are relatively fast compared to skeletal muscle.
C)may be graded.
D)utilizes GTP rather than ATP.








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