Quiz on Muscle Histology

Which of following protein regulates the length of the actin polymers during myogenesis?

• Myomesin

• Titin

• Nebulin

• α-actinin

Which of following structures is NOT found in the smooth muscle cells?

• Caveolae

• Dense body

• Calmodulin

• T-tubules

Identify the INCORRECT statement:

• White muscle fibers depend largely on anaerobic metabolism

• There is a modified perimysium around the muscle spindle

• In a muscle with coarser movements, a motor unit innervates a single muscle fibers

• In the absence of ATP, the actin-myosin cross-bridges become stable

During skeletal muscle contraction, which of following does NOT occur?

• Neither the thick nor the thin filaments change their length

• Pivot in the myosins

• Sliding of filaments

• The stimulation is propagated to more distant fibers via gap junctions

In cardiac muscle, how many transverse tubule crosses in the vicinity of two sarcomeres?

• 1

• 2

• 2.5

• 3