Muscle Contraction

A mitochondria's role in muscle contraction is the production of...

• Synthesis of ATP
• Metabolism of ATP
• Synthesis of Proteins
• Metabolism of Worn out Proteins

Tags

NGSS.HS-LS1-7

Which ion, when present, changes the conformation of tropomyosin?

• Calcium
• Sodium
• Potassium
• Lithium

In order for tropomyosin to change conformation, calcium has to bind with...

• Voltage Gated Ion Channel
• Ligand Gated Ion Channel
• Troponin Protein
• Actin Protein

What opens the Calcium Ion Transport Channel embedded in the pre-synaptic terminal?

• Binding of Acetylcholine
• Binding of Calcium Ion
• An Action Potential
• Binding of Sodium Ion

Calcium that will eventually enter the muscle cell to bind with troponin is stored in the...

• T-Tubule of the Muscle Cell
• Sarcoplasmic Reticulum of the Muscle Cell
• The Sarcolemma of the Muscle Cell
• The interstitial space outside the muscle cell near the pre-synaptic terminal.

During muscle contraction the 'Z' Lines will...

• Disappear
• Get Farther apart
• Get Closer Together
• Appear Thicker

given the following events:

1.acetycholine broken down

2.acetylcholine moves across the synaptic cleft

3.action potential reaches the terminal branch (presynaptic terminal)

4.acetylcholine combines with a receptor molecule on a skeletal muscle (postsynaptic membrane)

5.action potential produced in skeletal muscle cell

Choose the arrangement that lists the events in the order the occur at a neuromuscular injunction

• 2,3,4,1,5

• 3,2,4,5,1

• 3,4,2,1,3

• 4,5,2,1,3

The nerve releases a chemical called a

• neurotransmitter

• neuron

• myofibril

• cell

Match the following

• sarcoplasm

• Rodlike contractile element within a muscle fiber containing myofilaments

• sarcolemma

• skeletal cytoplasm

• Elastic filament (titin)

• Skeletal plasma membrane

• myofibril

• allows recoil of the muscle fiber when contraction ends

• sarcoplasmic reticulum (SR)

• endoplasmic reticulum that surrounds the myofibrils

As calcium binds to actin the myosin heads are allowed to bind to the actin forming a cross-bridge and begin to slide over mysoin.

• True

• False

Tags

NGSS.HS-LS1-7