Question

Study the following and choose the correct statements.
• Sarcoplasmic reticulum is the store house of calcium ions.
• Thin filament of a myofibril is formed by actin, troponin and myosin molecules.
• Thick filaments of myofibril are held together by M-line.
• The portion of myofibril between two successive M-lines is called sarcomere.

• A. I, III
• B. II, IV
• C. I, II
• D. III, IV

Hint:

Muscle facts: \[ \boxed{ \begin{aligned} &\text{SR} &&\rightarrow \text{Stores Ca}^{2+} &\text{Thin filament} &&\rightarrow \text{Actin + Tropomyosin + Troponin} &\text{Thick filament} &&\rightarrow \text{Myosin} &\text{Sarcomere} &&\rightarrow \text{Between two Z-lines} \end{aligned} } \]

Answer 1

The Correct Option is A