Each meromyosin has two
1. globular head with a short arm
2. Important part- HMM and LMM
3. Tails and one head
4. Short arms and one tail

The globular head is/has
1. An active ATPase enzyme
2. Binding sites for ATP
3. active sites for actin
4. All of these

Mechanism of muscle contraction is best explained by
1. Sliding Filament Theory
2. Sliding fibre theory
3. Sliding myofibre theory
4. Muscle sliding theory

Sliding Filament Theory states that
1. Contraction of muscle fibre takes place by the sliding of thin filaments over the thick filaments
2. Contraction of muscle fibre takes place by the sliding of thick filament over thin Filaments
3. Relaxation of muscle fibre takes place by the sliding of thick filament over thin filaments
4. Relaxation of muscle fibre takes place by the sliding of thin filament over thick filament

Muscle Contraction is initiated by
1. A signal sent by CNS via a motor neuron
2. A signal sent by PNS via a motor neuron
3. A signal sent by ANS via efferent neuron
4. A signal sent by ANS via efferent neuron

A neural signal reaching the neuromuscular junction releases …………. which generates an action potential in the ………..
1. Acetylcholine, Sarcolemma
2. Inositol, Sarcolemma
3. GABA, Sarcoplasmic reticulum
4. GABA, Sarcoplasm

The calcium ions released in sarcoplasm will bind to
1. Tropomyosin
2. Troponin
3. Actin
4. Meromyosin

The binding of troponin on actin Filaments actually masks the …..
1. Active site for Tropomyosin
2. Active site for ATP
3. Active site for Myosin
4. Active site for troponin

The binding of calcium to troponin actually indicates
1. Unmasking of Myosin binding site over meromyosin
2. Unmasking of Myosin binding site over actin
3. Unmasking of actin binding site over Myosin
4. Unmasking of actin binding site over tropoiosin

During contraction of muscle fibres which of the following does not happen?
1. The length of A band gets reduced
2. The attached actin Filaments are pulled towards the centre of A band
3. The Z line attached to actin Filaments is pulled inward
4. Shortening of sarcomere