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Muscular System
Test Description: Review over the Muscular System
Instructions: Answer all questions to get your test result.
1) Where is the protein called actin loacted in the body?
A
ATP molecules
B
thin filaments
C
myosin filaments
D
acetylcholine neurotransmitters
2) In addition to myosin, what other protein is involved in skeletal muscle contraction?
A
actin
B
melanin
C
collagen
D
keratin
3) The ion necessary to link myosin to actin for muscule contraction is:
A
magnesium
B
sodium
C
calcium
D
potassium
4) Muscle tone refers to:
A
a state of sustained, partial contraction of muscles that is necessary to maintain posture
B
the ability of a muscle to maintain contraction against an outside force
C
the condition athletes attain after intensive training
D
a feeling of well-being following exercise
5) What happens when the thin filaments in a muscle fiber slide over the thick filaments?
A
a muscle relaxes
B
a muscle neither contracts nor relaxes
C
a muscle contracts
D
a muscle both contracts and relaxes
6) Myosin and actin make up
A
myofibrils
B
osteoblasts
C
collagen
D
red marrow
7) What tough connective tissue joins skeletal muscles to bones?
A
tendons
B
ligaments
C
periosteum
D
joints
8) The concept used to explain the action of filaments in muscle contraction is the
A
acitn contraction model
B
rigor mortis
C
sliding-filament model
D
myosin contraction model
9) Regular exercise does the following:
A
decreases the amount of calcium in the muscles
B
increases the amount of calcium in the muscles
C
decreases the number of myofibrils which increases muscle size and strength
D
increases the number of myofibrils which increases muscle size and strength
10) Rigor Mortis is a stiffening of the muscles after death due to:
A
the Calcium levels are higher than the ATP levels which keeps the myosin binded to the actin
B
the muscles dehydrate and remain in the stiffened position
C
Rigor Mortis is a skeletal disorder, not muscular
D
the ATP levels are higher than the Calcium levels which keeps the myosin binded to the actin
*select an answer for all questions
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