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WorksheetsReview 2.9 - 2.10: Sarcomeres and Contraction
Total questions: 20
Worksheet time: 15mins
Name
Class
Date
1.
Muscles are wrapped in a connective tissue called ...
a)
Epimysium
b)
Perimysium
c)
Endomysium
2.
Muscle cells are also called ...
a)
Muscle fibers
b)
Myofibrils
c)
Fascicles
3.
Muscles are made of bundles of muscle fibers called ...
a)
Fascicles
b)
Myofibrils
c)
Tendons
4.
The contractile protein fibers inside of muscle cells are called ...
a)
Myofibrils
b)
Sarcolemma
c)
Fascicles
5.
Muscle cells appear striated because of their ...
a)
Dark and light bands
b)
Z discs and M lines
c)
Thick and thin filaments
6.
Sarcomeres _____ during contraction.
a)
Shorten
b)
Lengthen
c)
Do not change
7.
The contractile units of muscle fibers are called ...
a)
Sarcomeres
b)
Myofibrils
c)
Z discs
d)
A and I bands
8.
Sarcomeres are separated by a ____.
a)
Z disc
b)
M line
c)
H zone
d)
A band
9.
Which filament within a myofibril are anchored to the Z disc?
a)
Thin filaments
b)
Thick filaments
10.
Which filament within a myofibril are attached to the M line?
a)
Thin filaments
b)
Thick filaments
11.
Which filament within a myofibril are made of myosin proteins?
a)
Thin filaments
b)
Thick filaments
12.
Why are the A bands on myofibrils so dark under microscopy?
a)
They contain both thick and thin filaments.
b)
They contain only thick filaments.
c)
They contain only thin filaments.
13.
When a nerve cell initially triggers a muscle cell to contract, ____ is released from the nerve cell into the muscle cell.
a)
Acetylcholine
b)
Calcium
c)
Troponin
d)
Tropomyosin
14.
During contraction, ____ is released from the sarcoplasmic reticulum inside of muscle cells.
a)
Acetylcholine
b)
Calcium
c)
Troponin
d)
Tropomyosin
15.
During contraction, calcium binds with ____ -- a protein that is attached to thin filaments.
a)
Troponin
b)
Tropomyosin
c)
Actin
d)
Myosin
16.
During contraction, in order to make the binding sites on the thin filaments accessible, _____ needs to move out of the way.
a)
Tropomyosin
b)
Troponin
c)
Myosin
d)
Active
17.
During contraction, a "cross bridge" is formed when the "head" of a(n) _____ binds to a thin filament's binding site.
a)
Thick filament
b)
Actin
c)
Troponin
d)
Tropomyosin
18.
During contraction, the "head" of a thick filament bends and pulls on the thin filament when _____.
a)
ADP and phosphate are released from it
b)
ATP binds to it
c)
ATP breaks down into ADP and phosphate
19.
During contraction, the "head" of a thick filament releases from the thin filament when ____.
a)
ADP and phosphate are released from it
b)
ATP binds to it
c)
ATP breaks down into ADP and phosphate
20.
In order for contraction to end and a muscle to relax, what needs to happen?
a)
The nerve cell stops releasing acetylcholine
b)
The muscle cell stops releasing calcium
c)
The binding sites on the thin filaments get blocked
d)
All of these things need to happen for a muscle to relax.
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