$A$: On repeated application of stimuli,involuntary striped muscles undergo fatigue.
$R$: This is due to non-availability of $ATP$ molecules.

Locomotion requires a perfectly coordinated activity of:

Fill in the blank spaces:
$(a)$ All mammals (except a few) have ............. cervical vertebra.
$(b)$ The number of phalanges in each limb of human is ............. .
$(c)$ Thin filament of myofibril contains $2 \,'F'$ actins and two other proteins namely .............. and ........... .
$(d)$ In a muscle fibre $Ca^{++}$ is stored in ............. .
$(e)$ .............. and .............. pairs of ribs are called floating ribs.
$(f)$ The human cranium is made of .............. bones.

Analogy type questions:
$(1)$ All locomotion : movement :: all movement : ...........
$(2)$ Cilia in trachea : help in removing dust particles :: Ciliated cells of female reproductive system : .........

Match List-$I$ with List-$II$.

List-$I$	List-$II$
$(a)$ Scapula	$(i)$ Cartilaginous joints
$(b)$ Cranium	$(ii)$ Flat bone
$(c)$ Sternum	$(iii)$ Fibrous joints
$(d)$ Vertebral column	$(iv)$ Triangular flat bone

Choose the correct answer from the options given below.

Volkmann's canals are found in: