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WorksheetsMuscle Physiology
Total questions: 34
Worksheet time: 17mins
Name
Class
Date
1.
What is the name of the protein myofilament that pulls the actin towards the center of the Sarcomere?
a)
Fascicle
b)
Actin
c)
Myosin
d)
Titin
2.
What is the name give to the thin protein filaments within the muscle contractile unit?
a)
Myosin
b)
Actin
c)
Myoglobin
d)
Haemoglobin
3.
Which of the following is the name given to the connective tissue that covers of a muscle fascicle or bundle of muscle?
a)
Endomysium
b)
Perimysium
c)
Epimysium
d)
Myofilament
4.
What is the name of the connective tissue covering that covers the entire muscle organ?
a)
Endomysium
b)
Perimysium
c)
Epimysium
d)
Fascicle
5.
Which one of the following is a key characteristic of small muscle fibers?
a)
They contain large amounts of Mitochondria
b)
They are fast to fatigue
c)
They are recruited last
d)
They contain low numbers of Mitochondria
6.
Which one of the following is a key characteristic of the largest muscle fibers?
a)
They are Red in color, meaning they contain a lot of mitochondria
b)
They contract rapidly with great force but fatigue fast (as they use creatine phosphate pathway)
c)
They are recruited for long duration activities
d)
They contain high numbers of Mitochondria
7.
What is the name given to the contractile units repeated along the myofibrils?
a)
Fascicles
b)
Perimysium
c)
Sarcomere
d)
Fascia
8.
The segment of a myofibril that is called a sarcomere runs from _______________.
a)
one Z line to the next Z line
b)
one H zone to the next H zone
c)
one A band to the next A band
d)
one end of a skeletal muscle to the opposite end
9.
Into what does the neuron release its neurotransmitter at the neuromuscular junction?
a)
motor end plate
b)
cytoplasm of the muscle cell
c)
terminal cisternae
d)
synapse
10.
Which of these statements is correct regarding muscle contraction?
a)
All motor units act together
b)
Muscle contraction continues for long periods after nervous stimulation ceases
c)
The myosin heads bind to the actin and shorten the sarcomeres
d)
Troponin is not needed to strengthen the contracting muscle cell.
11.
Each muscle fiber is directly surrounded by connective tissue called the
a)
perimysium
b)
fascia
c)
endomysium
d)
epimysium
12.
Which of the following is not a component of a thin filament?
a)
actin
b)
myosin
c)
troponin
d)
tropomyosin
13.
Which of the following statements concerning the role of Ca2+ in the contraction of skeletal muscle is correct?
a)
The mitochondria act as a store of Ca2+ for the contractile process
b)
Ca2+ entry across the plasma membrane is important in sustaining the contraction of skeletal muscle
c)
A rise in intracellular Ca2+allows actin to interact with myosin
d)
The tension of a skeletal muscle fibre is partly regulated by G proteins.
14.
Muscle fatigue sets in due to the nonavailability of
a)
calcium
b)
ATP
c)
actin binding sites
d)
sodium
15.
Which of the following sets of ions are needed in the muscle fiber to eventually cause a contraction?
a)
sodium and potassium
b)
calcium and magnesium
c)
sodium and calcium
d)
sodium and magnesium
16.
The neurotransmitter always used at the neuromuscular junction is:
a)
It depends upon the type of muscle being innervated
b)
noradrenaline
c)
acetylcholine
d)
dopamine
17.
Which of the following steps occurs last in this series?
a)
Calcium enters the neuron and attaches to synaptic vesicles that carry acetylcholine
b)
sodium enters and an action potential occurs across the sarcolemma
c)
calcium attaches to troponin and causes a change in the shape of the tropomyosin
d)
the myosin head binding sites are exposed
18.
Which of the following steps occurs first?
a)
myosin heads attach to actin
b)
myosin heads pivot pulling the actin filament toward the center
c)
cross-bridges detach from actin when a new ATP binds to myosin
d)
another cross-bridge forms
19.
Which structure contains large amounts of calcium used for muscle?
a)
sarcomere
b)
mitochondria
c)
sarcoplasmic reticulum
d)
myofibril
20.
With what do we regulate contractile force?
a)
motor units
b)
muscle fascicles
c)
glucose
d)
ATP
21.
Which is NOT a phase of a muscle twitch
a)
latent period
b)
contractile period
c)
relaxation period
d)
Systolic Period
22.
If we wanted to pick up something very light, would we want our innervation ratio to be very high, or very low? Remember, An innervation ratio is the average number of muscle fibers per motor neuron
a)
Very high
b)
Very low
23.
The thick filament is composed of:
a)
Myosin
b)
Actin
24.
Fill-in-the-blank! Muscle, Muscle Fascicle, _____, Myofibril
a)
Muscle fiber
b)
Myofilament
c)
Sarcomere
d)
Actin
25.
Actin filaments bound to the edges of the sarcomere, in zig zag structures also known as the...
a)
M-Line
b)
H-Zone
c)
Z-Lines
d)
A-Band
26.
covers the actin and prevents the myosin head to attach to the actin (rope or strand shape).
a)
tropomyosin
b)
Myosin and actin
c)
Calcium and Oxygen
d)
Glycogen and hemoglobin
27.
Which of the following muscle types is involved in peristalsis (swallowing) and not striated?!
a)
Smooth
b)
Skeletal
c)
Cardiac
d)
All of the above are striated
28.
Involuntary
a)
skeletal
b)
cardiac
c)
smooth
d)
smooth and cardiac
29.
attached to bones
a)
cardiac
b)
smooth
c)
skeletal
30.
found in heart
a)
smooth
b)
cardiac
c)
skeletal
31.
When all of the little twitches blend together until they feel like one gigantic contraction ..it's called
a)
Tetanus
b)
Fermentation
c)
Cellular Respiration
32.
Concerning the Cross Bridge Cycle, When ADP leaves the myosin head, the ________
a)
the myosin head goes into the cocked or ready position
b)
myosin head pulls on the actin and the sarcomere shortens
c)
The myosin head enters the high energy state and only binds to the actin filament
d)
the myosin head enters the low energy state
33.
Which of the following is NOT a muscle function?
a)
Movement of skeleton
b)
Heat generation
c)
Transport substances around body
d)
Moves neurons around body
34.
Calcium is stored in the _________________ and binds to ___________________ causing tropomyosin to expose myosin binding sites on actic
a)
Sarcoplasmic Reticulum/Troponin
b)
Sarcoplasmic Reticlum/Myosin heads
c)
Endoplasmic Reticulum/Troponin
d)
Endoplasmic Reticulum/Myosin heads
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