What initiates muscle contraction?
Video Quiz: Muscle Contraction

Interactive Video
•
Science
•
12th Grade
•
Easy
Mae-Lee Terrell
Used 5+ times
FREE Resource
11 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Release of calcium ions
Direct stimulation of muscle fibers
A signal from the nervous system
The skeletal system
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is released at the neuromuscular junction to stimulate muscle fibers?
Adenosine triphosphate (ATP)
Calcium ions
Acetylcholine
Myosin
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How is the action potential transmitted within a muscle fiber?
Through transverse tubules
By direct stimulation of myofibrils
Via the sarcoplasmic reticulum
Through the skeletal system
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What are the two types of filaments involved in muscle contraction?
Myosin and collagen
Actin and elastin
Collagen and elastin
Myosin and actin
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What happens during the power stroke phase of muscle contraction?
Myosin heads pull actin filaments towards the center of the sarcomere
Calcium ions are released into the muscle fiber
Acetylcholine is released at the neuromuscular junction
ATP is synthesized
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the role of ATP in muscle contraction?
It binds to myosin, allowing it to detach from actin
It is broken down to release calcium ions
It acts as a neurotransmitter at the neuromuscular junction
It generates the initial action potential
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How do myosin heads reactivate for another cycle of contraction?
By releasing acetylcholine
By detaching and reattaching to actin with the help of ATP
By synthesizing more calcium ions
By generating an action potential
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