Muscle Contraction Essentials

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Quiz on skeletal muscle contraction steps.

Created by

Anju Prabhakar

India

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Froggy Jumps Muscle Contraction EssentialsOnline version Quiz on skeletal muscle contraction steps. by Anju Prabhakar 1 Which ion triggers contraction by binding to troponin? a Sodium b Potassium c Calcium 2 Which organelle stores calcium released during contraction? a Golgi apparatus b Mitochondrion c Sarcoplasmic reticulum 3 Binding of myosin to actin forms what structure? a Cross-bridge b Actin filament c Sarcomere 4 Which action uses ATP to detach the myosin head? a Cross-bridge formation b Power stroke c Detachment of the myosin head 5 What triggers the power stroke movement? a Release of Pi after myosin-Actin binding b Binding of ATP c Calcium binding to troponin 6 Depolarization in a muscle fiber activates which channel? a Potassium channels b Sodium channels c DHPR (Dihydropyridine receptor) in the T-tubule 7 Which pump moves calcium back into the sarcoplasmic reticulum? a SERCA pumps b Phospholipase A2 c Na+/K+-ATPase 8 Removal of Ca2+ from troponin results in what? a Relaxation as actin sites are blocked b Immediate tetanus c Continued contraction 9 What is the role of ATP in the cross-bridge cycle? a Stabilizes actin filament b Provides Ca2+ for release c Detaches and re-cocks the myosin head 10 During contraction, what happens to the sarcomere length? a Shortens (I-band and H-zone reduce) b Lengthens c Remains constant

Froggy Jumps

Muscle Contraction EssentialsOnline version

Quiz on skeletal muscle contraction steps.

by Anju Prabhakar

Which ion triggers contraction by binding to troponin?

Sodium

Potassium

Calcium

Which organelle stores calcium released during contraction?

Golgi apparatus

Mitochondrion

Sarcoplasmic reticulum

Binding of myosin to actin forms what structure?

Cross-bridge

Actin filament

Sarcomere

Which action uses ATP to detach the myosin head?

Cross-bridge formation

Power stroke

Detachment of the myosin head

What triggers the power stroke movement?

Release of Pi after myosin-Actin binding

Binding of ATP

Calcium binding to troponin

Depolarization in a muscle fiber activates which channel?

Potassium channels

Sodium channels

DHPR (Dihydropyridine receptor) in the T-tubule

Which pump moves calcium back into the sarcoplasmic reticulum?

SERCA pumps

Phospholipase A2

Na+/K+-ATPase

Removal of Ca2+ from troponin results in what?

Relaxation as actin sites are blocked

Immediate tetanus

Continued contraction

What is the role of ATP in the cross-bridge cycle?

Stabilizes actin filament

Provides Ca2+ for release

Detaches and re-cocks the myosin head

During contraction, what happens to the sarcomere length?

Shortens (I-band and H-zone reduce)

Lengthens

Remains constant

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Muscle Contraction Essentials

Froggy Jumps

About this activity

Created by

Download the paper version to play

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Muscle Contraction EssentialsOnline version

by Anju Prabhakar

Which ion triggers contraction by binding to troponin?

Which organelle stores calcium released during contraction?

Binding of myosin to actin forms what structure?

Which action uses ATP to detach the myosin head?

What triggers the power stroke movement?

Depolarization in a muscle fiber activates which channel?

Which pump moves calcium back into the sarcoplasmic reticulum?

Removal of Ca2+ from troponin results in what?

What is the role of ATP in the cross-bridge cycle?

During contraction, what happens to the sarcomere length?

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