The chief inorganic constituent of bone is needle like crystals of hydroxyapatite, a form of ……….
a) sodium sulphate
b) calcium phosphate
c) calcium sulphate
d) potassium chloride
Which of the following ions are also present in the matrix of bone?
a) sodium and magnesium
b) chloride and fluoride
c) bicarbonate and citrates
d) all of these
Calcium and phosphate may be released into the blood as needed; which of the following hormone/s control/s this?
a) paratharmone
b) calcitonin
c) thyroxin
d) both a and b
The colour of bone marrow is……..
a) red
b) orange
c) yellow
d) both a and c
Explanation: There are two types of bone marrow: red and yellow. Red bone marrow contains blood stem cells that can become red blood cells, white blood cells, or platelets.
A skeleton of cartilage supports human body, but by the time of birth much of the cartilage had been transformed into……..bones?
a) 206
b) 350
c) 300
d) 126
Explanation: later 144 bones are fuse in adult human
At adult stage, the human skeleton consists of ……..bones.
a) 206
b) 350
c) 300
d) 126
Explanation: many bones fused with one another and reduces from 350 to 206
