When comparing skeletal, cardiac, and smooth muscle structure
A) Cardiac muscle contains triads while skeletal muscle contains diads
B) Sarcomere structure in smooth muscle and cardiac muscle are the same
C) Skeletal muscle thin filaments have actin, troponin, and tropomyosin; smooth muscle lacks troponin
D) Skeletal muscles consume more energy than cardiac muscle as a result of the abundance of mitochondria
E) T-tubule diameter in smooth muscle is smaller than in cardiac muscle

Question

Quizplus · Accepted Answer

Skeletal muscle contains actin, troponin, and tropomyosin in the thin filaments while smooth muscle lacks troponin. Cardiac muscle also contains troponin in the thin filaments. The other choices are incorrect.

When Comparing Skeletal, Cardiac, and Smooth Muscle Structure