Which of the following is involved in the formation of endochondral bone?

Identify the parts $A$ and $B$ from the given diagram.

What is the skeletal system? Explain.

Which of the following is not a function of the skeletal system?

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.

Which one of the following is the correct description of a certain part of a normal human skeleton?