24/25 - U3L3 Muscle Contractions Quiz Review
Authored by Jillian Gravelle
Science
9th - 12th Grade
Used 12+ times
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28 questions
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1.
MATCH QUESTION
1 min • 1 pt
Match the following:
troponin
a protein that makes up most of the thin filament. Binds with myosin head.
myosin binding site (on actin)
ATP dependent protein that binds to actin during cross-bridge formation and pulls the thin filament towards the M-line.
Actin
location on actin molecule that binds to the myosin head during cross-bridge formation.
tropomyosin
a protein connected to troponin that prevents myosin from binding to acing when calcium is not present - covers the myosin binding site.
myosin
Calcium dependent molecule that “shifts” tropomyosin away from the myosin binding site during contraction.
2.
MATCH QUESTION
1 min • 1 pt
Match the following
I-band
the boundary of a sarcomere anchored to the thick filament by titin.
M-Line
spans the length of the thick filament (myosin). Does not change during contraction.
H-zone
spans thick filaments only that shrinks during contraction and lengthens during relaxation.
Z-line
“mid-line” of the sarcomere that anchors the thick filaments. During contraction the thin filaments move towards the m-line.
A-Band
span that includes the thin filaments and z-lines that shortens during contraction and lengths during relaxation.
3.
MATCH QUESTION
1 min • 1 pt
Match the following
Acetylcholine
(Ach
a neurotransmitter that opens protein channels on the
sarcolemma.
Exocytosis
the end of a nerve cell.
Synaptic cleft
the space between the con terminal bud and the sarcolemma.
T-Tubules
an opening of the sarcolemma that allows for the electrical impulse to travel to the sarcoplasmic reticulum
Axon Knob
the process of a vesicle fusing with a cell’s membrane to release chemical substances into the extracellular environment.
4.
REORDER QUESTION
5 mins • 1 pt
Reorder the following steps (1-5) of a muscle contraction
Nerve Impulse reaches Neuromuscular Junction
ACH binds to Muscle Receptor Sites
Action Potential charge travels down muscle cell
Impulses reaches the SR and Ca+ channels open
Acetylcholine (ACH) Released by Motor Neuron
5.
REORDER QUESTION
5 mins • 1 pt
Reorder the following (6-10) of the muscle contraction
The muscle fiber shortens as contractions occurs
Tropomyosin molecules move and expose specific sites on actin where myosin heads can bind
Actin filaments are pulled toward the center of the sarcomere by pulling of the cross-bridges, increasing the overlap of the thin and thick filaments
Ca+ ions diffuse from the SR and bind to troponin molecules
Cross-bridges form, linking actin and myosin
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which is more true to cause muscle contraction?
7.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
Which ion, when present, changes the conformation of tropomyosin?
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