Read the following A to D statements and select the option that contains both correct statements:
A. Z-line is present in the centre of the light band.
B. Thin filaments are firmly attached to the M-line
C. The central part of thick filaments, not overlapped by thin filaments is called Z-band
D. Light band contains only thin filaments
(1) A and D           

(2) B and C             

(3) A and C                       

(4) B and D

ATPase of the muscle is located in:

(1) Actinin            

(2) Troponin         

(3) Myosin            

(4) Actin

Assertion  :       Muscle twitch is related with tetanus.

Reason    :     Tetanus is caused by many nerve impulses at a time.

Assertion  :       Extra oxygen consumption in human body is known as oxygen debt.

Reason    :     The extra oxygen is required by the body to oxidise the accumulated lactic acid produced during strenous exercise.

Assertion   :       Ball and socket joints are the most mobile joints.

Reason      :       Synovial fluid is present here.

Assertion   :       Arthritis or inflammation of a joint makes the joint painful.

Reason      :       Some toxic substances are deposited at the joint.

Assertion   :       Movement of body parts serves to change the body posture.

Reason      :       Body parts move in relation to body axis.

Assertion   :       There are similarities between the locomotion of unicellular organisms and multicellular animal.

Reason      :       Ciliary, flagellar and amoeboid movement occur in unicellular organisms.

Assertion   :       Starfish moves through crawling.

Reason      :       Starfish utilise a flow of water over the surface, for movement.

Assertion  :       Triceps is said to be an extensor muscle for elbow joint.             

Reason     :     Triceps relaxes durings extension of forearm at the elbow joint.