(a) Identify the figure

(b) Label W, X, Y and Z

(c) What is chemical composition of material of the figure

(d) What of the function of X?

(a) It is section of a bone.

(b) W-Periosteum; X-Haversian canel; Y-Canaliculus (plural canaliculi); Z-Endosteum.

(c) The chemical composition of material of bone includes (i) Ossein (30-40%), (ii) Mineral matter (60-70%) of calcium and magnesium carbonate and phosphate.

(d) Haversian canal tends to carry nutrients to the interior of the bone.