WorksheetsMuscular System
Total questions: 43
Worksheet time: 22mins
The lifting of a weight is an example of a (an) _________ contraction
isometric
tonus
isotonic
twitch
A muscle action whereby the palms are turned upward is
pronation
supination
rotation
elevatin
One of the proteins that form the thin myofilament of muslce fiber is _____; the protein of the thick myofilament is _____
troponin; tropmyosin
titin; nebulin
myosin; actin
actin; myosin
When a muscle cell is at rest, which type of ions are highly concentrated in the fluids that surround it?
phosphate
sodium
potassium
hydrogen
What happens in the sarcoplasmic reticulum as a result of the chemical changes caused by the arrival of acetylcholine at the sarcolema?
calcium ions are released
ion channels open in the sarcolema
calcium ions are removed from the sarcolema
the sarcolema contracts
what is the neurotransmitter for muscle contraction?
norepinephrine
troponin
actin
acetycholine
A backup energy source for muscle contraction is
ATP
myoglobin
creatine phosphate
oxygen
When a person performs strength enhancing exercises, the skeletal muscles get larger as a result of
the conversion of actin to myosin
atrophy
hypertrophy
an increase in te number of skeletal muscle cells
What is the contractile unit of muscle?
myofilaments
epimysium
sarcomere
z line
Muscle originates from
ectoderm
myoderm
mesoderm
endoderm
The head of the myosin molecule binds to
tropomyosin
thick filaments
thin filaments
membranes
all of the following factors can cause skeletal muscle atrophy except
increased intake of vitamin D
decreased insulin like growth factor
loss of nerve supply to the muscle
increased concentration of aromatase
the muscle action that decreases the angle of a joint is called
rotator
extensor
abductor
flexor
In flexion of the arm at the elbow, the ____ muscle contracts, and the ___ acts as an anatgonist
semitendinous; biceps
biceps; triceps
quadriceps; biceps
triceps; biceps
Which term describes the stable or immovable attachment point for a muscle?
tendonous portion
insertion
flexion point
origin
Which of the following best explains the striations in a striated muscle?
striations are a form of gross anatomy; their cause is under investigation
patterns of cytoskeleton proteins make the striations
striations are marks that appear in muscles that have contracted
regularly arranged nuclei cause the striations
A group of muscles that increase the angle of a joint
tensor
abductor
rotator
extensor
a group of muscles that move a bone in a circular direction
tensor
abductor
rotator
extensor
a group of muscles that turn the palm upward
extensor
adductor
supinator
sphincter
a group of muscles that decrease the size of an opening
extensor
adductor
supinator
sphincter
a group of muscles that move a bone away from the midline
tensor
abductor
rotator
extensor
a group of muscles that make a body part more rigid
tensor
abductor
rotator
extensor
a group of muscles that move a bone toward the midline
extensor
adductor
supinator
sphincter
shortest muscle in a muscle group
minimus
brevis
maximus
longus
largest muscle in a muscle group
minimus
brevis
maximus
longus
smallest muscle in a muscle group
minimus
brevis
maximus
longus
longest muscle in a muscle group
minimus
brevis
maximus
longus
biceps brachi
Q
R
S
T
Orbicularis oculi
K
L
M
N
rectus abdominus
C
D
E
F
adductor longus
T
U
F
G
Deltoid
P
Q
R
B
Sartorius
F
G
H
I
Pectoralis major
C
D
Q
R
Trapezius
B
C
D
E
triceps brachi
B
C
D
E
Sartorius
O
P
G
H
Gluteus maximus
M
N
O
G
hamstring group
C
K
G
H
sternocleido mastoid
A
B
C
D
Achilles tendon
G
H
I
Q
latissimus dorsi
L
M
N
O
extensor digitorum
F
H
J
K
