This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General physiology, Subject name: Physiology
Myosin and actin filaments are kept in place by 
Select and explain. 
A. Tropomyosin, B. Troponin, C. Actinin, D. Titin
D: Titin
Answer: D: Titin 
Explanation: Titin keeps actin and myosin in place It povides elasticity It is present in skeletal and cardic muscles Ref:Guyton and Hall textbook of medical physiology 12th edition ,pag number:85,86,87