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