What is the primary role of calcium in muscle contraction?
Excitation-Contraction Coupling in Skeletal Muscle [Part 2/2]

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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
To bind to myosin directly
To initiate the release of acetylcholine
To bind to troponin and facilitate crossbridge cycling
To provide energy for the power stroke
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which protein acts as a gatekeeper by holding tropomyosin over the binding sites on actin?
Myosin
Troponin
Actin
Calcium
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What must be bound to myosin for crossbridge formation to occur?
Tropomyosin
ADP and phosphate
Calcium
ATP
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
During the power stroke, what happens to the myosin head?
It releases calcium
It binds to ATP
It rotates and pulls the thin filament
It detaches from actin
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What causes the detachment of myosin from actin?
Release of ADP
Hydrolysis of ATP
Binding of calcium to myosin
Binding of ATP to myosin
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the role of acetylcholinesterase in muscle contraction?
To hydrolyze ATP
To initiate the power stroke
To degrade acetylcholine and help terminate contraction
To bind calcium to troponin
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What triggers the release of calcium from the sarcoplasmic reticulum?
Hydrolysis of ATP
Detachment of myosin from actin
Action potential reaching the transverse tubule
Binding of ATP to myosin
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