MCQ
Air moves into the lungs when
- AAtmospheric pressure is less than pressure within the lungs
- ✓Atmospheric pressure is greater than pressure within the lungs
- CAtmospheric pressure is equal to the pressure within the lungs
- DNone of these
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$(I)$ $RBCs$ are formed in the white bone marrow in adults.
$(II)$ $RBCs$ have red colour because presence of protein called haemoglobin.
$(III)$ Nucleus is present in $RBC$ in most of the mammals and are biconcave in shape.
$(IV)$ A healthy individual has $12 -16\, gms$ of haemoglobin in every $1000\, ml$ of blood.