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WorksheetsMuscle Structure & Contraction
Total questions: 57
Worksheet time: 31mins
Which thin filament protein binds to Ca during muscle contraction?
Actin
Myosin
Troponin
Tropomyosin
What is the name of the cell membrane surrounding each muscle fiber?
T Tubule
Sarcolemma
Sarcoplasm
Nucleus
What is the contractile unit of the muscle?
Z disk
Sarcomere
Muscle fiber
Muscle cell
What protein makes up the thick filaments?
Troponin
Tropomyosin
Myosin
Actin
What part of the muscle fiber stores Ca ions and releases them when stimulated?
T tubule
Sarcolemma
Nucleus
Sarcoplasmic reticulum
What is the name of the location where the neuron and muscle fiber meet?
Sarcoplasm
Sacolemma
Neuromuscular junction
Axon terminal
What is the name of the neurotransmitter that is released from the neuron to the sarcolemma?
Acetylcholine
Acetone
ATP
Calcium
Which of these occurs first during a muscle contraction?
The nerve signal reaches the neuromuscular junction
Ach is released and opens Na ion channels
The sarcomere shortens
The myosin binds to the actin
Which of these occurs last during a muscle contraction?
The nerve signal reaches the neuromuscular junction
Ach is released and opens Na ion channels
The sarcomere shortens
The myosin binds to the actin
Which number represents the Tendon?
(a)
Which number represents the Epimysium?
(a)
Which number represents the Perimysium?
(a)
Which number represents the Fascicle?
(a)
Which number represents the Muscle Fiber?
(a)
Which number represents the Sarcoplasmic reticulum?
(a)
Which number represents the Myofibril?
(a)
Which number represents the Filaments?
(a)
Which number represents the Endomysium?
(a)
Which number identifies the sarcomere?
(a)
Which number identifies myosin?
(a)
Which number identifies actin?
(a)
Which number represents the H zone?
(a)
Which number represents a region that disappears during muscle contraction?
(a)
Which number represents the I band region?
(a)
Which number represents the A band region?
(a)
The point at which the nerve cell reaches the sarcolemma of the muscle fiber is the _____.
Neurotransmitter
Acetylcholine
Synaptic cleft
Neuromuscular Junction
The gap between the nerve cell and sarcolemma is the ____ ___.
Synaptic cleft
Neurotransmitter
Motor unit
Neuromuscular junction
What is the specific neurotransmitter that stimulates the movement of skeletal muscles?
GABA
Acetylcholine
Serotonin
Dopamine
Once calcium is pumped into the axon terminal what happens?
The muscle contracts
ACh is released into the synaptic cleft.
Sodium pumps into the sarcolemma.
The muscle contracts.
What is the name of the component that houses the neurotransmitters?
Synaptic cleft
Acetylcholine
Receptors
Synaptic vesicles
What is the contractile unit formed from Z line to Z line?
Sarcomere
T Tubule
Sarcoplasmic reticulum
Fascicle
____________ attaches to actin to form the cross bridge.
Troponin
Tropomyosin
Myosin
Calcium
What does calcium attach in a muscle contraction?
Myosin
Tropomyosin
Troponin
Actin
Ca2+ will be released from the sarcoplasmic reticulum when
impulse reaches neuromuscular junction
impulse transmitted along T tubule
ATP binds to sarcoplasmic reticulum
acetyl choline binds to ligand gated ion channels
Rigor mortis occur because
Lack of calcium ions attach to tropomyosin
Lack of ATP attach to the myosin head
Muscle stiff due to lack of heat
Lactic acid accumulates in muscle
Power stroke will occur when
ATP binds to myosin head
Myosin head releases ADP and Pi
Myosin head hydrolyse ATP
Myosin binds to actin
Which of the following refers to the muscle cell?
Myofibril
Myofilament
Fascicle
Muscle fiber
A. Actin
B. Troponin
C. Trypsin
D. Tropomyosin
E. Myosin
F. Titin
What is a crossbridge?
Where myosin binds to actin
Where the calcium crosses into the cytoplasm
Where calcium binds with troponin
Where titin and myosin are connected
What does calcium do to the actin?
Covers myosin binding sites
Uncovers myosin binding sites
Covers actin binding sites
Uncovers actin binding sites
What is the name of the protein that covers the binding sites on actin?
Myosin
Titin
Troponin
Tropomyosin
What does the sarcoplasmic reticulum do?
Stores sodium
Stores ATP
Releases sodium
Stores calcium
What two chemicals are necessary for muscle contraction to occur?
Niacin and Potassium
Calcium and ATP
Sodium and Potassium
Acetylcholine and Potassium
Skeletal Muscle contraction is initiated when the ________ sends a message to the muscle cell.
Muscle cell
Gland
Neuron
None of the above
What is the name of structure #1?
Troponin
Tropomyosin
Actin
ATP
What is the name of structure #2?
Troponin
Tropomyosin
Actin
ATP
Muscle fiber
What would the predominant muscle fiber type be for this athlete?
Medium twitch
What would the predominant muscle fiber type be for this athlete?
