The above figure is related with myosin monomer (meromyosin). Identify A to C:

(1) A - head, B - cross arm, C - GTP binding sites

(2) A - head, B - cross arm, C - Ca⁺² binding sites

(3) A - head, B - cross arm, C - ATP binding sites

(4) A - cross arm, B - head, C - ATP binding sites

The action potential that triggers a muscle contraction travels deep within the muscle cell by means of:

(1) Sarcoplasmic reticulum                

(2) Transverse tubules

(3) Synapse                                      

(4) Motor end plates

ATP provides energy for muscle contraction by allowing for:

1. An action potential formation in the muscle cell

2. Cross-bridge attachment of myosin to actin

3. Cross-bridge detachment of myosin from actin

4. Release of Ca⁺² from sarcoplasmic reticulum

A motor unit is best described as:

(1) All the nerve fibres and muscle fibres in a single muscle bundle

(2) One muscle fibre and its single nerve fibre

(3) A single motor neuron and all the muscle fibres that it innervates

(4) It is the neuron which carries the message from muscle to CNS

Electrical excitation in a muscle fibre most directly causes:

(1) Movement of tropomyosin

(2) Attachment of the cross bridges to actin

(3) Release of Ca⁺² from sarcoplasmic reticulum

(4) Splitting of ATP

The energy for muscle contraction is most directly obtained from:

(1) Phosphocreatine                          

(2) ATP

(3) Anaerobic respiration                   

(4) Aerobic respiration

Put the following phrases in proper order to describe what occurs at the neuromuscular junction to trigger muscle contraction:

1. II, IV, I, VI, VII, III, V           

2. II, IV, VI, I, VII, III, V

3. I, II, III, IV, V, VI, VII             

4. VII, VI, V, IV, III, II, I

Go through the following diagram describing muscle contraction:

Now identify A to E:
(1) A - Cross bridge, B - Cross bridge formation, C - Breaking of cross bridge, D - Sliding (rotation), E - ATP

(2) A - Cross bridge, B - Cross bridge formation, C - Sliding / rotation, D - Breaking of cross bridge, E - ATP

(3) A - Cross bridge, B - Breaking of Cross bridge, C - sliding / rotation, D - Cross bridge formation, E - AMP

(4) A - Cross bridge, B - Cross bridge formation, C - Sliding / rotation, D - ADP, E - Breaking of cross bridge

The muscle band that remains unchanged during muscle contraction and relaxation of the skeletal muscle is:

(1) I                     

(2) A                    

(3) H                    

(4) Z-line

The compound or pigment acting as an oxygen store in skeletal muscles is:

(1) Myoglobin                                    

(2) Haemoglobin

(3) Myokinase or ATP                         

(4) Cytochrome