Name: 
 

Chapter 49.5-49.7 Online Review



Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.
 
 
Use the figure below to answer the following questions.

chpt49ms_files/i0020000.jpg
 

 1. 

Which section consists of both actin and myosin filaments?
a.
A
b.
B
c.
C
d.
D
e.
E
 

 2. 

Which of the following does not form part of the thin filaments of a muscle cell?
a.
actin
b.
troponin
c.
tropomyosin
d.
myosin
e.
calcium-binding site
 

 3. 

Which function associated with muscle would be most directly affected by low levels of calcium?
a.
ATP hydrolysis
b.
the initiation of an action potential
c.
the muscle fiber resting membrane potential
d.
muscle contraction
e.
muscle fatigue
 

 4. 

Which of the following could you find in the lumen of a transverse tubule?
a.
extracellular fluid
b.
cytoplasm
c.
actin
d.
myosin
e.
sarcomeres
 

 5. 

Which of the following are shared by skeletal, cardiac, and smooth muscle?
a.
A bands and I bands
b.
transverse tubules
c.
gap junctions
d.
motor units
e.
thick and thin filaments
 



 
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