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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
melanin
B
keratin
C
collagen
D
actin
3) The ion necessary to link myosin to actin for muscule contraction is:
A
calcium
B
potassium
C
magnesium
D
sodium
4) Muscle tone refers to:
A
the condition athletes attain after intensive training
B
a feeling of well-being following exercise
C
a state of sustained, partial contraction of muscles that is necessary to maintain posture
D
the ability of a muscle to maintain contraction against an outside force
5) What happens when the thin filaments in a muscle fiber slide over the thick filaments?
A
a muscle contracts
B
a muscle neither contracts nor relaxes
C
a muscle relaxes
D
a muscle both contracts and relaxes
6) Myosin and actin make up
A
collagen
B
osteoblasts
C
myofibrils
D
red marrow
7) What tough connective tissue joins skeletal muscles to bones?
A
joints
B
tendons
C
periosteum
D
ligaments
8) The concept used to explain the action of filaments in muscle contraction is the
A
myosin contraction model
B
sliding-filament model
C
acitn contraction model
D
rigor mortis
9) Regular exercise does the following:
A
decreases the amount of calcium in the muscles
B
decreases the number of myofibrils which increases muscle size and strength
C
increases the amount of calcium in the muscles
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
Rigor Mortis is a skeletal disorder, not muscular
B
the muscles dehydrate and remain in the stiffened position
C
the Calcium levels are higher than the ATP levels which keeps the myosin binded to the actin
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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