Instructions: Answer the USMLE question(s) below, choose one answer from the multiple choices, and then check the correct answer by clicking on 'get answer' button.
Question:
An experiment is conducted to determine the difference between skeletal and smooth muscle contraction. Isolated guinea pig intestine and skeletal muscle are stimulated, and the contractile properties of each are studied. The two muscle types differ because skeletal muscle contraction, but not smooth muscle contraction, requires which of the following?A. Actin
B. Calmodulin
C. Myosin
D. Myosin light-chain kinase
E. Troponin
