Skeletal Muscle Organization AP I

Front

Muscle cells are filled with long cylinders called...

Back

myofibrils

Front

The 2 proteins that work together to contract muscles are ...

Back

myosin and actin

Front

What is labeled "1" in the diagram?

Back

sarcolemma

Front

What is labeled "4" (the blue/purple part) in the diagram?

Back

sarcoplasmic reticulum

Front

What is labeled "2" (the yellow part) in the diagram?

Back

transverse (T) tubules

Front

Contractile unit of a muscle.

Back

sarcomere

Front

What is another name for the thin filaments of the sarcomere?

Back

actin

Front

Structure C is known as the thick filament of the sarcomere, it is also known as

Back

myosin

Front

Structure A is on either side of the sarcomere, it is called the

Back

Z line

Front

The unit between A and A is called

Back

a sarcomere