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Muscle Sarcomere Anatomy
Test Description: Questions about proteins and movements of sarcomere.
Instructions: Answer all questions to get your test result.
1) The Light I Band consists of...
A
Actin filaments only
B
Myosin filaments only
C
none of these
D
Myosin and actin filaments
2) The functional unit of the muscle cell is the:
A
Muscle fiber
B
Sarcomere
C
Myofilament
D
Osteon
3) The thick filament is composed of:
A
Actin
B
Nebulin
C
Myosin
D
Myomesin
4) The thin filament is composed of:
A
Myomesin
B
Actin
C
Nebulin
D
Myosin
5) Fill-in-the-blank! Muscle, Fascicle, _____, Myofibril
A
Sarcomere
B
Myofilament
C
Muscle fiber
D
Actin
6) Actin filaments our bound to the edges of the sarcomere, also known as the...
A
M-Line
B
H-Zone
C
Correct Z-Disc
D
A-Band
7) The ________ functions in regulation of Ca2+ levels.
A
Sarcoplasmic Reticulum
B
T Tubules
C
Mitochondria
D
Fascicle
8) ___ and ___ are regulatory proteins bound to actin.
A
Troponin and tropomyosin
B
Glycogen and hemoglobin
C
Myosin and actin
D
Calcium and Oxygen
9) Which of the following is NOT a function of the muscular system?
A
Communication
B
Heat production
C
Joint stability
D
Movement
10) Which of the following sections of a sarcomere does not shorten during contraction?
A
H zone
B
I band
C
Distance between Z lines
D
A band
*select an answer for all questions
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