Actin and Myosin in muscle fibril are arranged
1. Parallel to each other and perpendicular to the longitudinal axis of the myofibrils
2. Perpendicular to each other and parallel to the longitudinal axis of the myofibrils
3. Parallel to each other and parallel to the longitudinal axis of the myofibrils
4. Perpendicular to each other perpendicular to the longitudinal axis of the myofibrils

Which of the following is not attributed with Actin filament?
1. Thin filament
2. Light bands
3. Isotropic bands
4. None of these

Which of the following is not true regarding Z line?
1. Made up of elastic fibres
2. Present in centre of each I band
3. It bisects the I band
4. Thin Filaments are superficially touching to Z line

Which of the following is not true regarding M line?
1. Thin membrane
2. Fibrous
3. Holds thick filament of A band
4. Keeps the Actin filament in centre

Sarcomere is
1. Functional unit of contraction
2. Portion between two successive Z lines
3. A part of myofibrils
4. All of these

Thin filament is made up of two.....which in turn are made up of many…..
1. F actins, G actins
2. G actins, Factins
3. G actins, g actins
4. F actins, f actins

How many F actins are there in a thin filament?
1. Two
2. Many
3. Only one
4. Depends upon thickness

How many G actins are there in a thin filament?
1. Two Filaments of many G actins
2. One filament of hundreds of G actin
3. Two Filaments of two hundreds of G actin
4. Two Filaments of two G actins

How many Filaments are there in thin filament?
1. Two actin Filaments and two tropomyosin filaments
2. Two actin Filaments and one tropomyosin filaments
3. One actin filament and one tropomyosin filament
4. One actin and two tropomyosin filament

Subunit of troponin masks the
1. Active binding sites for Myosin on actin
2. Active binding sites for actin on Myosin
3. In resting state, active binding sites for Myosin on actin
4. In resting state, active binding sites for actin on Myosin