Name the following :

(a) A joint which allows movements in all directions.

(b) The first vertebra of the vertebral column.

(c) A large hole at the back of cranium through which the spinal cord emerges out.

(d) The muscles which cause opposing movements.

(e) The fluid found between the two bones of freely movable joints.

The first pair indicates the kind of relationship that exists between the first two terms. Rewrite and complete the second pair on a similar basis :

(a) Humerus : Glenoid cavity :: Femur : ……………

(b) Thoracic vertebrae : 12 : …………… : 7

(c) Wrist : Carpals :: Ankle : ……………

(d) Biceps : Flexor :: Triceps : ……………

(e) Brain : Cranium :: Spinal cord : ……………

Define:

(a) Skeleton system

(b) Bone marrow

(c) Gristle

(d) Pivot joint

(e) Antagonistic muscles

Do the muscles pull the structures, or push them? Explain briefly.