Question

 1)____________ is the amount of pressure on the blood as a result hearts pumping 

2)the red blood cells are produced in the ____________

3) the ________ present in the air are nitrogen oxygen carbon di oxide and water vapour

Answer 1

1)hypertension
2)red bone marrow
3)gases

Answer 2

1.hypertension.
2.bonemarrow.
4.gases