In bones blood is formed in.
a) calcium
b) phosphorous
c) iron
d) bone marrow
All the bones are united with one another at the joints forming a frame called…….
a) skeleton
b) joints
c) muscles
d) bones
There are………bones in the human skeleton?
a) 186
b) 206
c) 217
d) 232
The exchange of oxygen between blood and air takes place in the…….
a) Nose
b) lungs
c) heart
d) all of these
When we inhale air the lungs………..
a) expand
b) contract
c) exhaled
d) none of these
Lungs are surrounded by………..
a) bones
b) ribs
c) muscles
d) cells
