Muscle Contraction Review

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

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

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

• Sarcoplasm
• Sarcolemma
• Sarcoplasmic Reticulum
• Myoglobin

The mechanism of muscle contraction.

• sarcoplasmic reticulum
• fasciitis
• sliding filament mechanism
• muscle cramps

Region where a motor neuron comes in close contact with a muscle cell.

• neurotransmitter
• muscular dystrophy
• muscle tension
• neuromuscular junction

The functional unit of the muscle cell is the: 

• Sarcomere
• Osteon
• Myofilament
• Muscle fiber

During the first phase of contraction, what leaves the neuron and binds to the muscle fiber?

• A neurotransmitter called Acetylcholine (ACh)
• Calcium ions
• Sodium ions
• An action potential

What is the name of the thick myofilaments?

• Actin
• Myosin
• Myoglobin
• Titan

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

• Actin
• Myosin
• Myoglobin
• Titan

Contractions are generated by

• shortening of thick filaments
• shortening of thin filaments
• sliding of thin filaments past thick filaments
• "accordian-like" folding of thick and thin filaments

a bundle of muscle fibers

• actin
• mysoin
• fascicle
• sarcomere