
Muscle Contraction Mechanisms and Processes

Interactive Video
•
Biology, Science, Physical Ed
•
11th - 12th Grade
•
Hard

Patricia Brown
FREE Resource
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10 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the initial role of excitation in muscle contraction?
To stimulate an action potential in the myofiber's sarcolemma
To release calcium ions into the sarcoplasm
To bind myosin to actin filaments
To directly shorten the sarcomeres
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the process called that links excitation to the sliding of filaments?
Calcium ion diffusion
Excitation-contraction coupling
Action potential propagation
Muscle contraction
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Where does the action potential travel after reaching a transverse tubule?
Directly to the sarcomeres
Along the sarcolemma
To the terminal cistern of the sarcoplasmic reticulum
Into the cytosol
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which receptors are stimulated by the action potential in the t-tubule?
Actin receptors
Myosin receptors
Dihydropyridine receptors
Troponin receptors
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What happens when dihydropyridine receptors undergo a conformational change?
They shorten the sarcomeres
They trigger ryanodine receptors
They bind to actin filaments
They release calcium ions into the sarcoplasm
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Why do calcium ions diffuse into the cytosol from the sarcoplasmic reticulum?
Because of a higher concentration in the sarcoplasm
To bind directly to myosin
Due to a concentration gradient
To initiate action potential
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the role of calcium ions in the sarcoplasm?
To bind to troponin on thin filaments
To inhibit myosin binding
To stimulate action potentials
To directly cause muscle contraction
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