The given bar graph shows the concentration of oxygen in blood samples from four places (P, Q, R and S) in the circulatory system of a man. Which sample was taken from the
pulmonary artery?
A P
B Q
C R
D S
The given bar graph shows the concentration of oxygen in blood samples from four places (P, Q, R and S) in the circulatory system of a man. Which sample was taken from the
pulmonary artery?
A P
B Q
C R
D S