WorksheetsMuscle Contraction Steps
Total questions: 20
Worksheet time: 12mins
Name
Class
Date
1.
Which ion below IS NOT critical to muscle contraction?
a)
Sodium Ion
b)
Calcium Ion
c)
Potassium Ion
d)
Phosphorus Ion
2.
Which of the Proteins listed below IS NOT a myofibril protein?
A. Actin
B. Troponin
C. Trypsin
D. Tropomyosin
E. Myosin
F. Titin
A. Actin
B. Troponin
C. Trypsin
D. Tropomyosin
E. Myosin
F. Titin
a)
All of these listed are myofibril proteins
b)
Troponin is not a myofibril protein.
c)
Trypsin is not a myofibril protein.
d)
Titin is not a myofibril protein.
3.
A mitochondria's role in muscle contraction is the production of...
a)
Synthesis of ATP
b)
Metabolism of ATP
c)
Synthesis of Proteins
d)
Metabolism of Worn out Proteins
4.
The _____ of a cell would be responsible for synthesis of the myofibril proteins.
a)
Mitochondria and Leukoplasts
b)
Ribosomes and Golgi Apparatus
c)
Rough and Smooth ERs
d)
Nucleus and Mitochondria
5.
Which protein is responsible for helping the muscle 'relax' back to its neutral position?
a)
Actin
b)
Myosin
c)
Titin
d)
Tropomyosin
6.
Which is more true to cause muscle contraction?
a)
Actin Pulls on the myosin
b)
Myosin Pulls on the Titin
c)
Myosin Pulls on Actin
d)
Actin Pulls on Titin
7.
Which ion, when present, changes the conformation of tropomyosin?
a)
Calcium
b)
Sodium
c)
Potassium
d)
Lithium
8.
Which TWO IONS are pumped in/out of the sarcolemma as part of muscle contraction?
a)
Sodium / Calcium
b)
Calcium / Potassium
c)
Sodium / Potassium
9.
In order for tropomyosin to change conformation, calcium has to bind with...
a)
Voltage Gated Ion Channel
b)
Ligand Gated Ion Channel
c)
Troponin Protein
d)
Actin Protein
10.
What opens the ligand gated sodium/potassium channel?
a)
Calcium Ion Binding to the channel protein.
b)
Acetylcholine binding to the channel protein.
c)
Electrical Signal opening the channel protein.
d)
Acetylcholinesterase binding to the channel protein.
11.
What opens the Calcium Ion Transport Channel embedded in the pre-synaptic terminal?
a)
Binding of Acetylcholine
b)
Binding of Calcium Ion
c)
An Action Potential
d)
Binding of Sodium Ion
12.
Calcium that will eventually enter the muscle cell to bind with troponin is stored in the...
a)
T-Tubule of the Muscle Cell
b)
Sarcoplasmic Reticulum of the Muscle Cell
c)
The Sarcolemma of the Muscle Cell
d)
The interstitial space outside the muscle cell near the pre-synaptic terminal.
13.
Which of the following occurs first in muscle contraction?
a)
Calcium Ion Enters the Pre-synaptic Terminal
b)
Acetylcholine Enters the Synaptic Cleft
c)
Sodium Ion Enters the Sarcolemma
d)
Calcium Ion Enters the Sarcoplasm (Cytoplasm).
14.
Which of the following occurs first in muscle contraction?
a)
Myosin /Actin Cross bridge shifts to move actin.
b)
Phosphate is released form the myosin globular head
c)
Calcium Enters the Sarcoplasm (Cytoplasm) of the muscle cell.
d)
ADP is released form the myosin globular head.
15.
Which of the following occurs first in muscle contraction?
a)
Myosin globular head 'uncoils' releasing stored energy.
b)
Cross Bridges are formed between actin and myosin
c)
Tropomyosin changes shape (conformation) to expose myosin binding sites.
d)
Calcium Binds with Troponin
16.
A build up of charge in the sarcolemma reaches _____ to begin the propagation of an action potential down the length of the sarcolemma.
a)
Capacity
b)
Threshold
c)
Ionization
d)
Critical
17.
During muscle contraction the 'Z' Lines will...
a)
Disappear
b)
Get Farther apart
c)
Get Closer Together
d)
Appear Thicker
18.
During full muscle contraction the H Zone will...
a)
Disappear
b)
Get wider
19.
During full muscle contraction the A Band will...
a)
Disappear
b)
Get wider
c)
Stay the same
d)
Get narrower
20.
During an electrocution which probably occurs?
a)
All 638 skeletal muscle might relax simultaneously.
b)
All 638 muscle cells may contract simultaneously.
100 %
