How Muscles Contract

Which ion below IS NOT critical to muscle contraction?

• Sodium Ion
• Calcium Ion
• Potassium Ion
• Phosphorus Ion

Which of the Proteins listed below IS NOT a myofibril protein?
A.  Actin
B.  Troponin
C.  Trypsin
D.  Tropomyosin
E.  Myosin
F.  Titin

• All of these listed are myofibril proteins
• Troponin is not a myofibril protein.
• Trypsin is not a myofibril protein.
• Titin is not a myofibril protein.

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

The _____ of a cell would be responsible for synthesis of the myofibril proteins.

• Mitochondria and Leukoplasts
• Ribosomes and Golgi Apparatus
• Rough and Smooth ERs
• Nucleus and Mitochondria

Tags

NGSS.HS-LS1-6

Which protein is responsible for helping the muscle 'relax' back to its neutral position?

• Actin
• Myosin
• Titin
• Tropomyosin

Which is more true to cause muscle contraction?

• Actin Pulls on the myosin
• Myosin Pulls on the Titin
• Myosin Pulls on Actin
• Actin Pulls on Titin

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

• Calcium
• Sodium
• Potassium
• Lithium

Which TWO IONS are pumped in/out of the sarcolemma as part of muscle contraction?

• Sodium / Calcium
• Calcium / Potassium
• Sodium / Potassium

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 ligand gated sodium/potassium channel?

• Calcium Ion Binding to the channel protein.
• Acetylcholine binding to the channel protein.
• Electrical Signal opening the channel protein.
• Acetylcholinesterase binding to the channel protein.