$A$ curved bone is structurally designed to

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:
$(1)$ Active site for actin is present on the tail of myosin / head of myosin.
$(2)$ Movement of body parts in living organisms is induced / spontaneous.

What are the primary inorganic components of bone?

In children,the bones are more flexible and less brittle because their bones have:

Match Column $I$ with Column $II$.

Column $I$	Column $II$
$(a)$ Smooth muscle	$(i)$ Myoglobin
$(b)$ Tropomyosin	$(ii)$ Thin filament
$(c)$ Red muscle	$(iii)$ Sutures
$(d)$ Skull	$(iv)$ Involuntary