Skeletal Muscle Contraction

Skeletal Muscle contraction is initiated when the ________ sends a message to the muscle cell.  

• Muscle cell
• Neuron
• Gland
• None of the above

The gap between the neuron and muscle cell is called a __________.

• Synapse
• motor end plate
• Tight Junction
• Acetylcholine Junction

Because muscle cells have a charge difference inside and outside the cell, it's said to have _______________.  

• Action Potential
• A positive charge
• membrane potential
• A negative Charge

Inside a muscle cell that is at rest, the internal charge is _______.

• Negative
• Positive
• Neutral

Identify one factor that can cause the first sodium channel to open in a muscle cell.  

• Calcium ions being released from the sarcoplasmic reticulum.
• Acetylcholine being released from the motor neuron
• Calcium ions binding to troponin
• ATP causing the myosin heads to pop up.  

When all of the sodium channels open in the muscle cell, a ________ is created.  

• Negative Charge
• Resting potential
• Muscle relaxtion
• Action Potential

When Sodium ions fly into the muscle cell, it's said to be __________.

• Repolarizing
• Depolarizing
• Electrically neutral
• none of the above

What is the structure that stores the Calcium in the muscle cell.  

• Sarcoplasm
• Sarcolemma
• Sarcoplasmic Reticulum
• Myoglobin

What is the name of the thin filaments in the muscle cell?

• Actin
• Myosin
• Myoglobin
• Titan

What is the name of the Thick filaments?

• Actin
• Myosin
• Myoglobin
• Titan