2020 - Muscle 1

What is the function of T-tubules?

• store Ca++

• store Na++

• conduct action potentials

• synthesize proteins

What is the function of the sarcoplasmic reticulum (SR)?

• synthesize protein

• store Na+

• store Ca++

• conduct action potentials

Cardiac muscle cells are physically and electrically linked to each other by:

• Z-discs

• M-lines

• terminal cisternae

• intercalated discs

Which statement about smooth muscle is false?

• They have many nuclei

• They are not striated

• They have irregularly arranged contractile proteins

• They regulate flow through hollow organs

Which statement about skeletal muscle cells is false?

• They contain many nuclei

• Contraction is involuntary

• They are elastic

• They are extensible